I don’t know whether you happen ________ it, ...

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

I don't know whether you happen ____ it, but I'm going to study in USA this September.

A. to be heard　　 B. to be hearing

C. to hear　　 D. to have heard

高二英语单项填空简单题查看答案及解析

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

Shirley ______ a book about Tibet last year, but I don’t know whether she has finished it.

高二英语单项填空困难题查看答案及解析

Mr Smith ______ a book about China last year but I don’t know whether he has finished it.

A. has written     B. wrote      C. had written      D. was writing

高二英语选择题简单题查看答案及解析

Shirly ________ a book about China last year but I don’t know whether she has finished it.

A has written       B wrote      C had written    D was writing

高二英语单项填空中等难度题查看答案及解析

Are you wondering whether it’s worth going for a little jog? Don’t hesitate, and get your sports shoes on. A new study shows that proper running lowers the risk of death before the normal time.

In a survey of 14 previous studies from the US and Denmark, the group of researchers from institutes in Australia and Finland concluded that running would probably lead to improvements in population health and longevity（长寿）.The studies involved 232,149 participants over time periods ranging from 5. 5 to 35 years.

On the whole, people running any distance were related with a 27% lower risk of death from all causes than those who did not, the study shows. Running was also related with a 30% and 23% lower risk of death from cardiovascular（心血管的）disease and cancer.

Previous studies had concluded “inconsistent findings” about whether running could lower the risk of death before the normal time, according to the researchers. Lead researcher Jim White, a professor at Victoria University in Melbourne, told CNN: “Our recent findings may encourage physically inactive individuals to take up running and those who already run to keep on doing it.”

He added that doctors may be encouraged by our findings to promote running as a part of “lifestyle medicine”. In their paper, which will be published in the British Journal of Sports Medicine, the researchers say health professionals are sometimes wary of promoting running because vigorous（剧烈的）use of it has been linked with sudden heart death.

Jim and his team deny this by noting that the benefit of running outweighs the risk. However, they did say advice should be given on a case — by — case basis, as running might not be appropriate for everyone. Although running has a clear health benefit, the researchers point out that higher “doses” of running may not reduce the risk of death further. According to the WHO s guidelines, adults aged between 18 and 64 should take 150 minutes of gentle exercise or 75 minutes of vigorous exercise each week.

1.What did the new study focus on?

A.The benefit of jog. B.People’s lifestyles.

C.People’s living conditions. D.The popularity of jog.

2.What will the study contribute to according to Jim?

A.Doctors’ quicker treatment. B.People’s losing weight.

C.People’s involvement in running. D.Researchers’ promotion of sport.

3.What does the underlined word "wary" in paragraph 5 mean?

A.Certain. B.Tired.

C.Cautious. D.Confident.

高二英语阅读理解中等难度题查看答案及解析

We all know that water is tasteless. But it happens from time to time: you pick up the bottle of water you didn’t finish yesterday, and it tastes strange. Most often, you tend to drop the bottle in the trash bin, believing that the water has gone bad. But is it true?

According to Time, of course not, taste has little to do with quality of water.

According to Time, when water is exposed to the air for 12 hours, carbon dioxide interacts with the H2O in the water, and the pH value lowers slightly. As a result, the water has a different taste.

“But it’s most likely safe to drink,” Norwegian expert Truls Krogh told Science Nordic. “If the water is covered and of good quality to start with, in principle it can last a thousand years. That’s because when water is fresh, it contains little organic matter. As long as water is held in clean glasses or bottles, no pollutants will enter it to harm our health.”

People in countries like the US, the UK and Australia usually drink tap water. According to Time, if tap water is drunk within six months, the chlorine (氯气) in the water will be enough to kill any bacteria and keep it safe to drink.

However, there are also some exceptions. If you accidentally put your fingers into water or store water in unclean containers day after day, microorganism (微生物) will enter the water.

With the help of surrounding temperature, and sunlight streaming through windows, these microorganisms multiply quickly. Sooner or later, the water will be in the charge of the unfriendly bacteria. And if you drink the water too often, then you’re more likely to be ill.

And what about water in plastic bottles? Heat and plastic are a bad combination, US researcher Kellogg Schwab stresses. When plastic bottles are used at high temperatures, they produce a chemical called BPA. BPA is something that affects hormones (荷尔蒙) and research has tentatively linked it to “several health damage, including heart disease and cancer”, Time reported.

Schwab suggests replacing disposable (一次性的) plastic bottles with the refillable containers made of metal or glass to deal with BPA.

1.The purpose of the first paragraph is to ________________.

A. show an example B. draw a conclusion

C. analyze a phenomenon D. introduce a topic

2.Which of the following may Truls Krogh agree?

A. If the water tastes different, we shouldn’t drink it.

B. The water held in a clean container is likely safe to drink.

C. Although kept fresh, water may still have much organic matter.

D. Covered water can last for a thousand years.

3.What can we infer from the passage?

A. BPA does little harm to our health.

B. Tap water is always safe to drink.

C. Microorganisms are easy to produce in the heat.

D. Disposable plastic bottles have been banned already.

4.What can be the best title of the passage?

A. Why Water is Tasteless B. How to Get Clean Water

C. Does Water Really Go Bad? D. Learn to Protect Water

高二英语阅读理解困难题查看答案及解析

—Would you like to go to the cinema with me tonight?

— I’d like to, but it remains ________ whether I can finish my homework in time.

高二英语单项填空中等难度题查看答案及解析

When your pet is sick, you know it needs medication. But pets, like babies, don't know the pill you want them to take will help them.____ 1.____ Here are some tips to help get your pet to take liquid medicine.

______2.______If the answer is yes, then your easiest path is to mix it with canned food. First give your hungry pet a small amount of canned food without the medication. It's important that the pet nibbles (一点一点地吃) at the food and sees that there's nothing wrong. Next, while the pet is still hungry, mix the medication in a small amount food and present it. Repeat as necessary to get the entire dose (剂量) down.______ 3.__ If the pet decides not to finish the meal, the dose will be wasted.

If the chemist says the medication cannot be taken with food, you need a syringe (注射器) or a dropper (滴管) to get the liquid down your pet's throat. _______4.________Keep a cheerful tone in your voice so the pet doesn't sense your stress or hesitation. Position your pet where it cannot run away, perhaps having a dog sit with his back against a wall or chair ---- or a cat on your lap. ____5.______ Use your other hand to insert the syringe or dropper between the cheek and back teeth. Slowly squeeze the medication so the pet won't choke. Try to keep your pet's mouth closed for approximately 30 seconds until you see it has swallowed. If your pet is being obstinate (倔强的) , stroke (抚摸) its throat gently or blow on the face.

Be sure you end the session with praise and perhaps a treat so your pet will not associate medication with a bad experience.

A. Before you call your pet in, be sure to have the medication and any other materials you’ll need ready.

B. Once the pet is in position, use one hand to gently open the pet's mouth from above, tilting back the head slightly.

C. Ask the vet if the liquid medication can be given with food.

D. You should know the reason why the pet refuses to take medicine.

E. Never mix the medication with the full meal.

F. They just know it smells funny and they don't want it.

G. Don't force your pet to swallow all the medicine.

高二英语信息匹配中等难度题查看答案及解析