It is 7 am and the alarm is going off. You know you have to be out of bed to catch the bus. But the urge to bury yourself in the bed is ever so strong. Sounds familiar? Why is it that teens find it difficult to get themselves out of bed in time every morning or stay sharp and focused during the first couple of hours of school?
During adolescence, the body goes through many changes and these include a shift in sleep patterns. Researchers from MIT have been tracking the body’s need for sleep in teenagers. They found that though adolescents need as much as 9.5 hours of sleep a day, they get to bed later and later with each passing year. In fact, the sleep cycle shifts later by as much as 12 to 18 minutes each year between the ages of 10 and 20! So by the time a 10yearold who sleeps at 8 pm grows to be 17 or 18, his body naturally wants to stay up till 10:30 pm or 11 pm.
According to researchers, this is because of a hormone called melatonin (褪黑激素) that is secreted (分泌) by the pineal gland — a tiny structure deep inside the brain. Melatonin regulates the body’s natural daynight rhythms. It causes a person to become sleepy by lowering his body’s core temperature. In teens, melatonin is secreted much later in the evening and continues to increase throughout the night. This makes it difficult for teens to fall asleep earlier as they did in their younger years. Likewise, the effect of melatonin continues until much later in the morning, making it hard for them to wake up early.
A study found that at least one in four teens is tired and falls asleep in school at least once a week. During sleep, important body functions and brain activities happen. So how can teenagers get their sleep enough? The American Academy of Pediatrics (AAP) recommends that middle and high schools should start later — not before 8:30 am. This should give teens some more time to sleep at night.
1.From Paragraph 2, we can learn that if you sleep late, the next day you should ________.
A. stay sharp B. skip breakfast
C. get up late D. stay up late
2.What does the underlined word “this” in Paragraph 3 refer to?
A. The students want to stay up.
B. The shifts of the sleep cycle.
C. The pineal gland secretes melatonin.
D. The adolescents sleep late.
3.The teens go to sleep later than before because ________.
A. melatonin is secreted much later
B. melatonin regulates the sleep time
C. they sleep a lot in the daytime
D. they need to finish their homework
4.According to AAP’s recommendation, middle and high schools should ________.
A. let teens sleep in the day B. let the students be active
C. delay the start time D. start later at 8 am
高二英语阅读理解中等难度题
It is 7 am and the alarm is going off. You know you have to be out of bed to catch the bus. But the urge to bury yourself in the bed is ever so strong. Sounds familiar? Why is it that teens find it difficult to get themselves out of bed in time every morning or stay sharp and focused during the first couple of hours of school?
During adolescence, the body goes through many changes and these include a shift in sleep patterns. Researchers from MIT have been tracking the body’s need for sleep in teenagers. They found that though adolescents need as much as 9.5 hours of sleep a day, they get to bed later and later with each passing year. In fact, the sleep cycle shifts later by as much as 12 to 18 minutes each year between the ages of 10 and 20! So by the time a 10yearold who sleeps at 8 pm grows to be 17 or 18, his body naturally wants to stay up till 10:30 pm or 11 pm.
According to researchers, this is because of a hormone called melatonin (褪黑激素) that is secreted (分泌) by the pineal gland — a tiny structure deep inside the brain. Melatonin regulates the body’s natural daynight rhythms. It causes a person to become sleepy by lowering his body’s core temperature. In teens, melatonin is secreted much later in the evening and continues to increase throughout the night. This makes it difficult for teens to fall asleep earlier as they did in their younger years. Likewise, the effect of melatonin continues until much later in the morning, making it hard for them to wake up early.
A study found that at least one in four teens is tired and falls asleep in school at least once a week. During sleep, important body functions and brain activities happen. So how can teenagers get their sleep enough? The American Academy of Pediatrics (AAP) recommends that middle and high schools should start later — not before 8:30 am. This should give teens some more time to sleep at night.
1.From Paragraph 2, we can learn that if you sleep late, the next day you should ________.
A. stay sharp B. skip breakfast
C. get up late D. stay up late
2.What does the underlined word “this” in Paragraph 3 refer to?
A. The students want to stay up.
B. The shifts of the sleep cycle.
C. The pineal gland secretes melatonin.
D. The adolescents sleep late.
3.The teens go to sleep later than before because ________.
A. melatonin is secreted much later
B. melatonin regulates the sleep time
C. they sleep a lot in the daytime
D. they need to finish their homework
4.According to AAP’s recommendation, middle and high schools should ________.
A. let teens sleep in the day B. let the students be active
C. delay the start time D. start later at 8 am
高二英语阅读理解中等难度题查看答案及解析
— Tom, have you heard the decision that we’re going to have 3 days off for the heavy snow?
— Yes, and I haven’t seen anyone who isn’t _______ the decision.
A. in honor of B. in search of
C. in place of D. in favor of
高二英语单项填空中等难度题查看答案及解析
—Look!Here comes the bus and I have to go now. Thank you for coming to see me off.
—Goodbye,and______!
A.congratulations B.all the best C.cheer up D.go ahead
高二英语单项填空简单题查看答案及解析
—Look!Here comes the bus and I have to go now.Thank you for coming to see me off.
—Goodbye,and________!
A.congratulations B.cheer up C.all the best D.go ahead
高二英语单项填空中等难度题查看答案及解析
---Look! Here comes the bus and I have to go now.
Thank you for coming to see me off.
--- Goodbye, _______.
A.congratulations | B.cheer up | C.all the best | D.go ahead |
高二英语单项填空简单题查看答案及解析
I don’t know whether you happen ________ it, but I am going to study in the UK for a year.
A. hear B. to hear
C. to be heard D. to have heard
高二英语单项填空困难题查看答案及解析
Creative alarm clocks
Dumbbell(哑铃) alarm clock
It is not a real dumbbell, but you have to shake it up and down 30 times to stop the alarm clock. And there is no stop button. Of course you will be totally refreshed by then. Don’t be lazy and take some exercise in the morning.
Target alarm clock
The alarm is ringing at the time you set it for!Do you see the target?Then hit it to stop the sound with a laser gun(激光枪). Of course you have to be fully awake if you don’t want to miss the target.
Flying alarm clock
I’m sure you won’t be able to simply ignore this alarm as you usually do, because it flies!Its propeller(螺旋桨)flying off the alarm is the key. Before the frightening alarm sounds drive you crazy, you’d better quickly put the key back.
Banclock
Have you been keeping a pocketful of change for some time without knowing what to do with it?Maybe you can put those coins in your alarm. This is both an alarm clock and a money box. It only stops ringing if you put a coin in it.
IQ alarm clock
What about a brain workout in the morning? IQ alarm will go off and ask you a set of IQ questions. Don’t even think about removing the battery, because it is hard to open. The only way to shut it off is to answer all questions correctly.
Mr. Bump-off-the-wall alarm clock
An alarm clock is so annoying when you are too tired and sleepy to get up. You can release your anger on Mr. Bump. It looks like a blue ball covered with “bandages(绷带)”. Just throw this alarm at the wall to silence it.
1.How can we turn off Target alarm clock?
A.By shooting at it. B.By shaking it 30 times.
C.By putting the key back on it. D.By answering questions shown on.
2.What is another function of Banclock?
A.Improving people’s sleep. B.Asking people to do exercise.
C.Testing people’s intelligence. D.Helping people to save money.
3.What can we infer about Mr. Bump-off-the-wall alarm clock?
A.It hangs on the wall. B.It is difficult to break.
C.It was invented by Mr. Bump. D.It rings louder than any other clocks.
高二英语阅读理解简单题查看答案及解析
Going to outer space is a little like going camping. You have to carry with you all the food and equipment you need for your trip, so your food can’t be too heavy or hard to prepare. Plus, there are no refrigerators to keep food cold and fresh. Food with all the water dried out is lightweight and doesn’t spoil(变坏). So, many space foods are dried on Earth and stored in special packets.
On Earth, gravity is the force that keeps your feet on the ground and your sandwich on your plate. But there’s no gravity in space. To keep food from floating(漂浮) away, astronauts on the Space Shuttle attach the packets to a special tray(托盘). The tray can be fixed to a wall or to the astronaut’s lap. To prepare their food, astronauts use liquid forms of salt and pepper. The liquid sticks to the food better. Regular salt and pepper would float away, maybe up an astronaut’s nose.
Liquids float right out of cups and glasses, though. So astronauts drink everything from a small bag with a straw(吸管) that can be closed. Astronauts say that most space foods taste pretty good. Some, such as apples and pudding, are the same as the foods you eat on Earth.
Astronauts eat tortillas instead of bread because they make fewer crumbs(碎屑). Floating crumbs could get stuck in equipment or an astronaut’s eye.
Your body uses food in space the same way it does on Earth. Your body must deal with waste in space too. During takeoff and landing, astronauts can’t leave their seats to go to the bathroom. They wear diapers(尿布) under their spacesuits instead. The Space Shuttle has a bathroom the size of a small closet. The toilet has bars that keep astronauts from floating away. A strong flow of air is used instead of water to flush waste down the toilet.
1.Why do astronauts use liquid forms of salt and pepper to prepare food?
A. Liquid doesn’t spoil.
B. Liquid is convenient to use in space.
C.Liquid is lightweight.
D. Astronauts are in great need of water.
2.What do astronauts think of space foods?
A. Most of them taste pleasant.
B. They are mostly fruits.
C.Most of them are rather cold.
D. They contain too little meat.
3.We can infer from the passage that astronauts ___________.
A. drink from cups and glasses
B. always wear diapers in space
C. can move freely during landing
D. must pay attention to crumbs in space
4.What is the passage mainly about?
A. Astronaut’s hard life in space.
B. How astronauts go to the bathroom.
C. The various foods astronauts eat in space.
D. How astronauts eat and deal with waste in space.
高二英语阅读理解简单题查看答案及解析
The surprising experiment I am about to describe proves that air is all around you and that it presses down upon you. Air pressure is a powerful force. When you swim underwater, you can feel water pushing on your body. The air all around you does the same. However, your body is so used to it that you do not notice this. The pressure is caused by a layer (层) of air called the atmosphere. This layer surrounds the Earth, extending to about five kilometers above the Earth’s surface.
The following experiment is an easy one that you can do at home. But make sure that you are supervised (监督), because you will need to use matches. Now for the experiment.
What you need
● hard-boiled egg without the shell
● A bottle with a neck slightly smaller than the egg
● A piece of paper
● A match
Method
1) Check that the egg will sit firmly on the neck of the bottle.
2) Tear the paper into pieces and put them into the bottle.
3) Light the paper by dropping a burning match into the bottle.
4) Quickly sit the egg on the neck of the bottle.
Result
Astonishingly, the egg will be sucked into the bottle. Your friends will be amazed when you show them the experiment. But be careful when you handle matches.
Why it happened?
As the paper burns, it needs oxygen and uses up the oxygen (air) in the bottle. The egg acts as a scale in the neck of the bottle, so no more air can get inside. This reduces the air pressure inside the bottle. The air pressure must equalize, so more air from outside must enter the bottle. The outside air presses against the egg, and then the egg is pushed into the bottle! This proves that air is all around and that it is pressing down on us.
1.Why is there the need to take care when you are doing the experiment?
A. The bottle could break.
B. You need to light the paper with a match.
C. The egg needs to be shelled (脱壳).
D. The egg has to be perfectly placed on the neck of the bottle.
2. How did the egg get into the bottle?
A. The oxygen inside the bottle sucked the egg in.
B. It became soft without the shell.
C. The neck of the bottle was wide enough.
D. The outside air pressure forced it into the bottle.
3.The experiment is carried out to prove___________..
A. water pushes on your body when you swim underwater
B. the earth is surrounded by a layer of air called the atmosphere
C. the pressure of air around us has a powerful force
D. the air pressure is not equalized around us
高二英语阅读理解中等难度题查看答案及解析
---- My leg hurts a lot
----You'd better go to the doctor and have it ____.
A.examined B.being examined C.to be examined D.examining
高二英语单项填空困难题查看答案及解析