Is it to control their body temperature? Save...

Facts about fevers

You wake up one morning, and your head feels like burning. Right away, you think, “Oh, no! I have a fever!” However, when you take your temperature, you see that it's only 37.2.1. Or, do you? From the standards in use for a long time, a fever starts at 38. Some doctors now don't agree with that, though. 2.It's the same for normal body temperatures.

They argue that everyone's normal body temperature isn't 37℃. It's 36.6 to 38℃ for kids and 36.1 to 37.2℃ for adults.3. Besides, people's body temperatures don't stay the same all the time.

When your body temperature is around 38℃, you have a fever.4.Fevers show that the body is doing its job. It's fighting the bad viruses and bacteria in your body. The body attacks them by turning up the heat. That way, it's harder for the viruses and bacteria to make copies of themselves. When their numbers decrease, the fever does, too.

5.So, let them do their jobs and don't treat them. Instead, try to find the cause and treat that. If the fever reaches 39.4C or higher, call your doctor. Do the same if the fever lasts longer than three days. Fevers fight to protect us, so they're our friends, not our enemies.

A.It means you have a fever.

B.Mild fevers don't last long.

C.So, you don't have a fever.

D.Fever does great harm to your body.

E.Women also have a higher number than men.

F.Many people think it's a bad thing, but it's not.

G.They feel our ideas about fevers are wrong and too old.

高二英语七选五中等难度题查看答案及解析

Is it to control their body temperature? Save energy? Find food? Tiger sharks at the Ningaloo Reef are thought to search the seafloor for prey as they dive down and swim up. But could there be other reasons why the sharks often move up and down through the water column?

That’s what UWA student Sammy is hoping to find out for her Ph.D. research. Sammy caught 24 tiger sharks at the Ningaloo Reef and attached tracking devices to them for up to 48 hours. The devices recorded activity rates and other data 20 times a second. The tags also contained video cameras, so Sammy could see the habitats the sharks moved through and the animals they met. She watched how the sharks reacted to prey and how the prey reacted to them.

Tiger sharks can be pretty lazy — something as simple as a turtle noticing a shark and turning away could cause the shark not to bother hunting it.

“Stomach content analysis has found their normal prey items, such as turtles, rays and fish,” Sammy said. “But have also found some really interesting things, such as license plates, cans and nails.”

Sammy said that studying tiger sharks can help her better understand the ecosystem as a whole. How they move through the Ningaloo Reef and feed can help her figure out how they might be impacting the animals beneath them in the food chain.

But hours of watching tiger sharks hunt hasn’t put Sammy off the animals at all. She said her time tagging sharks at the Ningaloo Reef was the best month of her Ph.D., if not her life. “At first, I was a bit apprehensive about it ... getting that close to some very big animals,” Sammy said. “But they were very frightened once you had them restrained alongside the boat. They’d just sit there; you’d attach the tag; you’d take the line off and they’d just swim off really calmly. It was pretty amazing to see these. They’re just absolutely beautiful animals.”

1.What can be the function of the first paragraph?

A.To give an example. B.To introduce the topic.

C.To make a comparison. D.To provide the background.

2.What does Sammy want to know through her research?

A.Why tiger sharks swim up and down. B.What tiger sharks like to hunt and eat.

C.How tiger sharks react in front of humans. D.Whether tiger sharks are endangered or not.

3.What can be inferred from the stomach content analysis?

A.Tiger sharks live happily in the sea. B.Tiger sharks are sensitive to some food.

C.Tiger sharks are lazier than expected. D.Tiger sharks have a very broad diet.

4.What does the underlined word “apprehensive” in the last paragraph mean?

A.Careless. B.Curious. C.Fearful. D.Cautious.

高二英语阅读选择中等难度题查看答案及解析

The reality TV wildlife edition has just come to a dramatic end. The world watched as the bears packed on pounds before they went into their den (兽穴) for the winter. Over the next few months, Fat Bear Week winner, 435 Holly, will go into hibernation (冬眠). Why do bears do this?

The mysteries around hibernating bears have attracted curious researchers for ages. What is hibernation, and what causes it? And probably most interestingly — could humans do this someday?

Dr. Kelly Drew, who studies hibernation, is one of the scientists consulting on a project funded by NASA, looking to put humans into hibernation for spaceflight. “For sending people to space, I think our first step is to perfect short-term hibernation-like periods in humans,” she says. “If we can figure this out, we can then try for longer periods.” We still have a long way to go before this science fiction dream becomes a reality, but several scientists around the country have been studying hibernation.

Cory Williams, at the University of Alaska Fairbanks, says, “A huge variety of mammals (哺乳动物) hibernate. However, hibernation in bears is different from that in small mammals…their body temperature only drops a few degrees and they don’t experience periodic rewarming.” In general, mammals with lower body temperatures during hibernation awaken every few days to raise their body temperature, or eat a bit. Bears do not emerge for any of these activities. Instead, they live off the fat they have collected during the summer and autumn months and even recycle their metabolic (新陈代谢的) waste.

At the moment, the study of hibernation has and continues to contribute greatly to applications in the human world. For example, bears are able to maintain their bone mass during hibernation, and understanding this could help advance the study of treating people with weak bones. Perhaps one day, it will be the key to sending humans far off into space too.

1.Why is 435 Holly mentioned in Paragraph 1?

A.To show the popularity of Fat Bear Week. B.To introduce the topic of hibernation.

C.To call for the protection of bears. D.To advertise reality TV.

2.How do bears hibernate?

A.They produce new body fat.

B.They lower their body temperature greatly.

C.They sleep through the whole winter.

D.They rewarm themselves regularly.

3.What’s the last paragraph mainly about?

A.The new findings about hibernation. B.The significance of studying hibernation.

C.The ways bears maintain their bone mass. D.The barriers to sending humans into space.

4.What’s the best title for the text?

A.What could bears and astronauts have in common?

B.What effects does hibernation have on bears?

C.Why do bears need to go into hibernation?

D.How do humans and bears get along?

高二英语阅读选择困难题查看答案及解析

Good posture certainly shows good health. It also adds to a body’s energy and beauty. The body is not handsome when the back is bent and neck thrusts forward. Bad posture suggests the impression that a person is tired, lacking in energy, bored, or weak. Tiredness may sometimes be the cause of bad posture. Most often, however, it is due to careless and poor health habits. Whatever it causes, bad posture affects one physically. The muscles are stretched and pulled into unnatural positions, which can lead to poor base of the body’s various systems.

Nutrition is the study of how the body takes food and uses it. This science provides information about the kinds of food a person must eat to improve and maintain good health. Such knowledge helps him develop and form people habits to his problems of healthful living. People habits of nutrition can be developed by paying attention to: (1) the variety of food included in the diet; (2) the quality of each kind of food eaten. A diet, or the food regularly eaten, must contain all the necessary factors.

Many physicians believe that overweight is one of the greatest dangers to good health. This condition often leads to a shorter life. An overweight person is also easier to suffer disease, and various disorders of the digestive system. A person’s weight directly has something to do with the amounts of food he eats.

All foods can make a person fat if too much is eaten. In reducing, the safe weight loss is about two pounds a week. The sensible way to lose weight is to decrease the gaining starchy(含淀粉的) foods, fats and sweets in the diet.

1. According to this passage, which of the following is suggested about the good health habits?

A. Good way of holding your body.             B. Balanced food.

C. Right body weight.                        D. All of the above

2. According to this passage, bad posture is most probably caused by_______.

A.  tiredness, boredom and weakness           B. lack of energy

C. carelessness and poor health habits           D. overworking and illness

3.Which of the following eating habits is NOT proper in terms of maintaining good health?

A. Vegetables, meat and water only

B. A suitable quantity of each kind of food

C. Fats being part of diet.

D. Various foods included in the diet

4. We can infer from the statement “all foods can make a person fat if too much is eaten” that___.

A. to lose weight you had better eat properly for daily meals

B. the most effective way to lose weight is to have no fat and sweet

C. even vegetables can make you put on weight, so there is no need to have fat and sweet.

D. a shorter life is a sure result of overweight

高二英语阅读理解中等难度题查看答案及解析

Ice volcanoes erupted on the shores of Lake Michigan last weekend, and an employee from National Weather Service ( NWS) caught sight of an astonishing scene on the spot. “You never know what you'll find at the lake until you go out there," the employee said, "Today it were volcanoes. ”

Despite their nickname, ice volcanoes aren't really volcanoes at all. They form at the edges of lakes, where thin sheets of ice form, and water shoots through holes in the ice, Water flows beneath the ice sheet and builds up enough pressure to push water to the surface. If the air above is cold enough, the released water freezes over the surrounding ground, forming a mini volcano of sorts.

Ice volcanoes can be very dangerous to climb on because they are empty inside and built over that hole in the ice. Although some frozen volcanoes were discovered a few years ago, it is still rare to witness one.

Ice volcanoes typically form near large bodies of water where freezing temperatures below allow an ice shelf to form over the water’s surface along the coastline. Meanwhile, waves beneath the shelf must be strong enough to crack the ice and push water out. For this reason, ice volcanoes tend to form along shorelines where winds blow up waves constantly.

For example, when the Oval Beach volcanoes were spotted, the wind was almost due west, which was perfect for pushing waves right into the shoreline at this location. Due to their superior size, the Great Lakes may be more likely to form ice volcanoes along their shores than smaller lakes.

So if you want to see an ice volcano in person, the Great Lakes may be your best choice—but be cautious where you step!

1.What did the NWS employee discover in Paragraph 1?

A.The eruption of ice volcanoes. B.Volcanoes erupting on the mountain.

C.Frozen shores of Lake Michigan. D.An ordinary scene of Lake Michigan.

2.What can we learn about ice volcanoes according to the passage?

A.They appear whenever it is freezing. B.They are real volcanoes in the ocean.

C.It is uncommon to see their eruptions. D.It takes years to form an ice volcano.

3.Where do the ice volcanoes usually form?

A.Shorelines with suitable weather conditions.

B.Smaller lakes where wind direction is perfect.

C.Along shorelines where waves are not powerful.

D.In the center of the ocean or large bodies of water.

4.What is this passage mainly about?

A.Dangers of ice volcanoes. B.Ice volcanoes and their formation.

C.Different kinds of volcanoes. D.The Great Lakes and ice volcanoes.

高二英语阅读选择中等难度题查看答案及解析

Bill Gates’ body might live in the present, but his brain lives in the future. He has made a career out of predicting what will happen in matters of computing, public health and the environment. He correctly predicted the rise of smartphones and social media, and his latest predictions could come true, too. Here’s what Gates predicts for the future of our world.

In his Annual Letter 2015, Gates made the prediction that Africa’s agriculture industry would increase productivity by 50% by 2030. Now the continent buys about $50 billion worth of food from other countries each year, although 70% of people in Africa are farmers. “In the next 15 years，however，creations in farming will solve the food problem in Africa,” Gates wrote. “The world has already developed crops that are more productive; with all the technologies, African farmers could possibly double their harvests.”

By 2035, there could be almost no poor countries. In his Annual Letter 2014, Gates bravely predicted that continued levels of foreign help could mean there would be almost no more poor countries by 2035. “Almost all countries will be what we now call lower-middle income or richer,” Gates explained. “Countries will learn from their most productive neighbors and benefit from things like better seeds and the digital revolution. ”

By 2030, the world will discover a clean-energy breakthrough to power our world. One of Gate’s more hopeful predictions which came in 2016 said that wind, solar, or some other renewable resources would power most of the world within 15 years. “The difficulty we face is big, perhaps bigger than many people imagine,” he wrote in his letter. “But so is the chance to make things better.” Many of the poor countries he visited had no running water or electricity. At night this meant they couldn’t light or power their homes, and keep businesses open.” If the world can find a type of cheap, clean energy, it will do more than prevent climate change,” he wrote. “It will change the lives of millions of the poorest families.”

1.What does the author think of Gates’ predictions?

A.They sound quite unreal. B.They are mainly about computers.

C.They will probably come true. D.They haven’t produced any end result.

2.How is the agriculture in Africa?

A.It is losing its workforce. B.It is in need of productivity.

C.It can satisfy the local needs. D.It is as backward as Africa’s industry.

3.What should poor countries do according to Gates?

A.Use expensive seeds. B.Expect less foreign help.

C.Rely on the digital revolution. D.Learn from the experience of other countries.

4.What’s Gates’ attitude to clean-energy development?

A.It’s no easy task. B.It’s hard to imagine.

C.It can put climate change to an end. D.It has little to do with poor families.

高二英语阅读选择简单题查看答案及解析

Try this: For an entire day, forget about the clock. Eat when you’re hungry and sleep when you’re tired. What do you think will happen?

You may be surprised to find that your day is much like most other days. You’ll probably get hungry when you normally eat and tired when you normally sleep. Even though you don’t know what time it is, your body does. These patterns of daily life are called circadian rhythms(生理节奏), and they are more than just habits. Inside our bodies are several clocklike systems that follow a roughly 24-hour cycle. Throughout the day and night, our inner clocks direct changes in temperature, body chemicals, hunger, sleepiness and more.

Everyone’s rhythms are different, which is why you might like to stay up late while your sister always wants to go to bed early. But on the whole, everyone is programmed to feel tired at night and energetic during the day. Learning about our body clocks may help scientists understand why problems arise when we act out of step with our circadian rhythms. For example, traveling across time zones can make people wake up in the middle of the night. Regularly staying up late can make kids do worse in tests.

“There is a growing sense that when we eat and when we sleep are important parts of how healthy we are,” says Steven Shea, director of the Sleep Disorders Program at Brigham and Women’s Hospital in Boston.

One way to learn about how our body clocks tick is to mess them up and see what happens. That’s what neurologist(神经病学家)Frank Scheer and his workmates did in a recent study. Staying up night after night, their studies suggest, could make kids extra hungry and more likely to gain weight. And regularly sleeping too little, Scheer says, may be one cause of the recent increase in childhood obesity.

1.What will happen if you forget about the clock according to the passage?

A.You will feel upset.

B.You will behave normally.

C.Your body will not know what time it is.

D.You will probably get hungry more easily.

2.Mike feels energetic at 12 midnight while Tom feels sleepy. What advice would be given by the writer?

A.Both should see a doctor. B.Tom should see a doctor.

C.Both should take it easy. D.Mike should have a watch.

3.How do Frank Scheer and his workmates study body clocks?

A.By seeing what happens when they are messed up.

B.By asking questions and collecting answers.

C.By studying people traveling across time zones.

D.By programming people with man-made clocks.

4.What will the writer most probably talk about next?

A.Other examples of what people will do when their body clocks go wrong.

B.Some effective medicines that can keep people from putting on weight.

C.The importance of eating healthy food.

D.What circadian rhythms are and how they work.

高二英语阅读选择困难题查看答案及解析

The WHO says that 80% of the world’s teens don’t get enough exercise to live healthy lives. The report was based on research done with students aged 11 to 17 in 146 different countries. 1. It’s a pity that not much has changed since then, as the WHO reports.

Doctors say 60 minutes of exercise daily is needed for teens to build up their bone and muscle strength. It’s also hugely important for the health of the heart and lungs. 2. Besides, more and more research is showing that exercise doesn’t just help the body, but also the brain, improving thinking, test scores, and school grades.

3. They were also very different between boys and girls. In the US, for example, 64% of boys were not active enough, compared to 80% of girls. South Korea was the country with the lowest activity levels — 91% of the boys and 97% of the girls didn’t get enough exercise.

One big reason for the lack of activity in today’s teens is technology, such as smartphones, computers and TVs. Many teens find it hard to pull themselves away from them. 4.

So the WHO warns that teens need to do less playing in the digital world, and more playing in the real world. Teens should take part in sports, whether on official teams or just playing around on the playground. 5. For many people, walking or biking to school is one way to make that happen. It’s very important for young people to build these habits now, because the positive effects of those habits can carry through into adult life.

A.Exercise benefits you academically.

B.Activity levels vary from country to country.

C.The WHO has spared no effort in the research.

D.Such inactivity can severely affect their growth.

E.Exercise can also be built into a normal day’s activities.

F.Regular activity can help them control their weight, too.

G.The WHO has been studying teen activity levels since 2001.

高二英语七选五中等难度题查看答案及解析

Sometimes willpower is a lot like the television remote control hard to find just when you want it most. ________ But there are ways to increase your willpower.

Don’t try to change your economic situation, win a promotion and lose weight all on the same morning. Set one clear, specific goal and make a realistic plan to achieve it. Extra willpower sometimes requires extra energy, so don’t spread yourself too thin. ________

Whatever your goal is, don’t spread it overnight. ________ If you are trying to kick a coffee habit, start by replacing your morning cup of coffee with a glass of water, instead of promising never to drink coffee again. Congratulate yourself on the small achievements. These successes help your willpower grow.

________ Ask friends, family or colleagues for assistance and tell them exactly how they can help. If your credit card bills have risen, for instance, let friends know that you are cutting back on expenses. Suggest having a common dinner instead of meeting at an expensive restaurant. Find support group or organization related to your goal and attend their meetings. You can get valuable advice, understanding and information.

If possible, change your environment to encourage positive behavior. Want to get in shape? Keep a set of workout clothes in your office as a reminder to stop by the gym on the way home. Quitting smoking? 　　　

A. Real success takes time.

B. Focus on one goal at a time.

C. Change your environment to change your life.

D. Improve your willpower by a support network.

E. Changing your behavior requires more than willpower.

F. Avoid bars or restaurants where you might be attracted to light up.

G. Breaking a bad habit or forming a new and healthy one can be difficult.

高二英语七选五中等难度题查看答案及解析

The Israeli farmers who pioneered the revolutionary technology known as drip irrigation（滴流灌溉） weren’t trying to solve one of the world’s most urgent problems. They were just trying to survive. They lived in the desert, and they didn’t have enough water to grow their crops.

In its simplest form, it was little more than a pipe with holes in it. But behind each hole was a hi-tech dripper that let out just the right amount of water. Snaked along a row of crops so that the holes were positioned directly above the roots, the pipe could direct each precious drop of water directly to the plants, getting a bigger harvest while using a very small amount of water.

Over time, the farmers improved upon the technology, perfecting the drippers that regulated the flow of water, and connecting the pipelines to computers that could determine exactly how much water each plant needed and when.

If the global population kept growing, the rest of the world would increasingly resemble their little community in the desert. So they began selling their irrigation systems in other parts of the world, eventually expanding to more than 110 countries. Netafirm, the company says it’s lifting people out of poverty and conserving water at a time when the importance of doing so has never been clearer.

The mass adoption of drip irrigation won’t save the world by itself. To avoid the coming catastrophe, nearly everybody will, in some way, have to do more with less, perhaps through accepting and using other new technologies. Otherwise, it’s going to get ugly.

1.Why is drip irrigation called “the revolutionary technology”?

A.It saves the world all by itself.

B.It is controlled by computers.

C.It makes irrigation more effective.

D.It provides deserts with water.

2.What does “one of the world’s most urgent problems” in Paragraph 1 refer to?

A.Lacking water. B.Lacking labor.

C.Lacking food. D.Lacking energy.

3.How does the drip irrigation help farmers with crops?

A.By drilling holes on the pipes.

B.By regulating water via drippers.

C.By snaking pipes along the crops.

D.By placing pipes just above roots.

4.Which of the following will be the best slogan for Netafirm to sell the irrigation systems?

A.Less water; More harvest.

B.New technology; New world.

C.More grain; Less starvation.

D.Water saving; World surviving.

高二英语阅读选择中等难度题查看答案及解析