If you use too much force, you’ll _______ the...

If you use too much force, you’ll _______ the key, bending it out of shape.

A. break　　 B. seize

C. twist　　 D. split

高二英语单项填空困难题查看答案及解析

Heat has been used to control hair for hundreds of years. But how much is too much? If you have ever opened a very hot oven, you know that heat can burn your eyebrows off your face very quickly. A scientist from Purdue University in Indiana is trying to find a scientific answer on how hot is too hot when it comes to your hair.

Many women and some men are very particular about their hair. Some people who have naturally curly hair prefer to have it straightened. Others with straight hair want to have curls. Tahira Reid is one of those people. As an African-American woman, she is familiar with the challenges of maintaining (保养) curly hair.

Tahira Reid and other researchers at Purdue University are studying how heat treatment interacts with different types of hair and how to prevent damage. Amy Marconnet is an assistant professor. She says the team is seeing how heat and temperature relate to their research.

In a Purdue University’s lab, team members designed a hair straightener tool —a flat iron with temperature control. They attached it to a robotic arm that moved over pieces of hair. They controlled the temperature while the device straightened hair.

What did they find? Their study found that the heat weakens or breaks a protein called keratin, responsible for the hair’s shape, and temporarily changes it. But nobody knows exactly what level can make the heat actually cause forever change. Researchers say early results are a bit inconclusive.

It turns out that everyone’s hair is different and there’s no exact temperature where hair straightening becomes hair damage. Ms Reid says they will continue their research in the hope of finding what works best without damaging hair.

1.What does the scientist want to find out?

A. Ways to protect our hair.

B. Ways to maintain curly hair.

C. The temperature that can damage hair.

D. The temperature that makes hair curly.

2.The underlined part “those people” in Paragraph 2 refers to those who ________.

A. are African-Americans

B. love their hair very much

C. love making their hair curly

D. love changing their hairstyle

3.When the heat breaks a protein called keratin in the hair, ________.

A. the hair gets burned

B. the hair’s shape is changed

C. the hair is forever damaged

D. the hair surely becomes curly.

高二英语阅读理解困难题查看答案及解析

If a diver surfaces too quickly, he may suffer the bends. Nitrogen(氮) dissolved(溶解) in his blood is suddenly liberated by the reduction of pressure. The consequence, if the bubbles (气泡)accumulate in a joint, is sharp pain and a bent body—thus the name. If the bubbles form in his lungs or his brain, the consequence can be death.

Other air-breathing animals also suffer this decompression(减压) sickness if they surface too fast: whales, for example. And so, long ago, did ichthyosaurs. That these ancient sea animals got the bends can be seen from their bones. If bubbles of nitrogen form inside the bone they can cut off its blood supply. This kills the cells in the bone, and consequently weakens it, sometimes to the point of collapse. Fossil (化石)bones that have caved in on them selves are thus a sign that the animal once had the bends.

Bruce Rothschild of the University of Kansas knew all this when he began a study of ichthyosaur bones to find out how widespread the problem was in the past. What he particularly wanted to investigate was how ichthyosaurs adapted to the problem of decompression over the 150 million years. To this end, he and his colleagues traveled the world’s natural-history museums, looking at hundreds of ichthyosaurs from the Triassic period and from the later Jurassic and Cretaceous periods.

When he started, he assumed that signs of the bends would be rarer in younger fossils, reflecting their gradual evolution of measures to deal with decompression. Instead, he was astonished to discover the opposite. More than 15% of Jurassic and Cretaceous ichthyosaurs had suffered the bends before they died, but not a single Triassic specimen(标本) showed evidence of that sort of injury.

If ichthyosaurs did evolve an anti-decompression means, they clearly did so quickly—and, most strangely, they lost it afterwards. But that is not what Dr Rothschild thinks happened. He suspects it was evolution in other animals that caused the change.

Whales that suffer the bends often do so because they have surfaced to escape a predator (捕食动物) such as a large shark. One of the features of Jurassic oceans was an abundance of large sharks and crocodiles, both of which were fond of ichthyosaur lunches. Triassic oceans, by contrast, were mercifully shark- and crocodile-free. In the Triassic, then, ichthyosaurs were top of the food chain. In the Jurassic and Cretaceous, they were prey(猎物) as well as predator—and often had to make a speedy exit as a result.

1.Which of the following is a typical symptom of the bends?

A. A twisted body.　　 B. A gradual decrease in blood supply.

C. A sudden release of nitrogen in blood.　　 D. A drop in blood pressure.

2.The purpose of Rothschild’s study is to see________ .

A. how often ichthyosaurs caught the bends　　 B. how ichthyosaurs adapted to decompression

C. why ichthyosaurs bent their bodies　　 D. when ichthyosaurs broke their bones

3.Rothschild’sfindingstatedinParagraph4 .

A. confirmed his assumption　　 B. speeded up his research process

C. disagreed with his assumption　　 D. changed his research objectives

4.Rothschild might have concluded that ichthyosaurs.

A. failed to evolve an anti decompression means

B. gradually developed measures against the bends

C. died out because of large sharks and crocodiles

D. evolved an anti decompression means but soon lost it

高二英语阅读理解中等难度题查看答案及解析

If practicing an attitude of gratitude (感激) during the storms of life is too much for you right now, that’s OK. When things are tough, most people have a hard time being thankful. They’re so caught up in what’s wrong in the present moment that they simply can’t see some things are still right.

If that’s true for you, then accept it. You’re going through a particularly difficult or unhappy period of time, and you don’t like it one bit. Very normal, very human. But remember this: there is always something to be grateful for. It may be only a small comfort right now, but it is a start. Make a list of some of the terrible things that didn’t happen. For example:

You’re in debt ... but you’re not homeless.

You lost your job ... but you didn’t lose your health.

You broke your leg … but you didn’t break your neck.

Your mother has Alzheimer’s disease ... but your father doesn’t.

No matter how bad things are, they could always be worse. Start finding gratitude for what might have happened, but didn’t. It does help a lot. Of course, you may not be thankful for everything — but you can always be thankful for something.

1.How many “terrible things that didn’t happen” are listed in this passage?

A. Two. B. Three. C. Four. D. Five.

2.The writer thinks it ______ for people to feel unhappy in time of difficulty.

A. necessary B. normal

C. great 　　 D. helpful

3.What is the purpose of this passage?

A. To discuss ways to make a list of terrible things.

B. To explain what is gratitude towards the storms of life.

C. To persuade people to be thankful for what didn’t happen.

D. To show people different ways to consider their tough situations.

4. How is the passage organized?

A. Explanation—Comparison—Topic

B. Argument—Opinion—Discussion

C. Comparison—Argument—Explanation

D. Introduction—Discussion—Conclusion

高二英语阅读理解中等难度题查看答案及解析

— Do you think the MP3 player put its listener ________?

— Yes, too much use of it could lead to hearing loss, experts say.

高二英语单项填空中等难度题查看答案及解析

1

If practicing an attitude of gratitude(感激） during the storms of life is too much for you right now, that’s OK. When things are tough, most people have a hard time being thankful. They're so caught up in what's wrong in the present moment that they simply can't see some things are still right.

If that's true for you, then accept it. You're going through a particularly difficult or unhappy period of time, and don't like it one bit. Very normal, very human. But remember this: there is always something to be grateful for. It may be only a small comfort right no, but it is a start. Make a list of some of the terrible things that didn't happen. For example:

       You're in debt... but you're not homeless.

       You lost your job... but you didn't lose your health.

       You broke your leg... but you didn't break your neck.

        Your mother has Alzheimers disease... but your father doesn't.

No matter how bad things are, they could always be worse. Start finding gratitude for what might have happened, but didn't. It does help a lot. Of course, you may not be thankful for everything- but you can always be thankful for something.

1.How many "terrible things that didn't happen" are listed in this passage?

A. Two       B. Three           C. Four            D. Five

2.The writer thinks it ____ for people to feel unhappy in time of difficulty.

A. necessary   B. normal          C. great            D. helpful

3..What is the purpose of this passage?

A. To discuss ways to make a list of terrible things

B. To explain what is gratitude towards the storms of life.

C. To persuade people to be thankful for what didn't happen.

D. To show people different ways to consider their tough situations.

4.. How is the passage organized?

A. Explanation―Comparison―Topic

B. Argument―Opinion―Discussion

C. Comparison―Argument―Explanation

D. Introduction―Discussion―Conclusion

高二英语简单题查看答案及解析

If you keep on eating too much, losing weight is_______.

A. out of the question  B. out of question  C. no question      D. beyond question

高二英语单项填空简单题查看答案及解析

Some people think that they will get ill if they use their brains（大脑）too much.  It is not true.  Through many researches, scientists show us that the more you use your brains, the better they will be, and the wiser you will become.

Of course, if you want to keep your mind clear and be energetic（充满活力的）, you must take a proper rest and study properly.  To the teenagers, using their brains in the morning is good for their health.

There are many ways to rest.  One is a peaceful rest.  Sleep is a peaceful rest.  Another is an active rest.  For example, take a walk outdoors, do morning exercises every day.  To change the way of the brains’activities（活动）is also a good way to rest.

In everyday life, to eat some eggs, meat, fresh vegetable and fruit is also good for the brains.

Wish you a wise man and a happy life.

1.If ________________ ,your mind will be clean?

2.Which of the following statements is false?

3.Which of the following is true according to the passage?

4.Which of the following can be used as the best title of the passage?

高二英语阅读理解中等难度题查看答案及解析

If you think you’ve gained too much weight or are too skinny, you can talk to a doctor. Your doctor will tell you _1.__.

If it is concerned about your height, weight, or BMI(体重指数)，your doctor may ask questions__2.__. Your doctor may also ask about your family background to find out if you’ve received something from your parents that might make you taller, shorter, or a late bloomer(someone who develops later than other people of the same age). The doctor can then put all the information together to decide _3.__.

If your weight isn’t in a healthy range, you will probably get specific diet and exercise recommendations (推荐)based on our individual needs,. Following a doctor’s or dietitian’s plan designed especially for you will work much better than following fad(时尚) diets. For teens, fad diets or starvation plans can actually slow down growth, and the weight loss usually doesn’t last.

What _4._? Most teens who weigh less than other teens of their age are just fine. They may be going through puberty on a different schedule than kids of the same age, and their bodies may be growing and changing at a different rate. Most underweight teens catch up in weight as they finish puberty during their later teen years so there’s rarely a need to try to gain weight.

In a few cases, teenagers can be underweight because of a health problem that needs treatment. If you feel tired or ill a lot, or __5.__, or other problems that have lasted for more than a week or two, be sure to let your parents or your doctor know.

A.whether you might have a weight or growth problem

B.if you have symptoms (症状)like a cough, stomachache.

C.about your health, physical activity, and eating habits

D.if you’re worried about being too skinny

E.if you take care of it

F.whether you’re growing normally

G.about your dieting

高二英语其他题中等难度题查看答案及解析

The key you have just got________the front door.

A. is used to opening              B. is used to be opened

C. is used to being opened          D. is used to open

高二英语单项填空中等难度题查看答案及解析