Scientists are increasely _____ that the eart...

Scientists are increasely _____ that the earth is getting hotter because of carbon dioxide and other gases.

A. content　         B. conscious         C. convinced　         D. common

高二英语单项填空中等难度题查看答案及解析

课文语法回顾

All scientists subscribe to the view that the increase in the earth’s temperature is due to the burning of fossil fuels like coal, natural gas and oil to produce energy. Some byproducts of this process1. (call) “greenhouse” gases, and the most important one of2.is carbon dioxide. Dr. Janice Foster explained “There is a natural phenomenon3.is called the greenhouse effect. This is when small amounts of gases in the atmosphere, like carbon dioxide, methane and water vapour trap heat from the sun and therefore warm the earth. 4.for the greenhouse effect, the earth would be about 33 degrees Celsius cooler　 than it is. So, we need those gases. The problem begins when we add huge quantities of extra carbon dioxide into the atmosphere. It means that more heat energy tends to be trapped in the atmosphere 5. (cause) the global temperature to go up.

高二英语语法填空中等难度题查看答案及解析

_______ is believed, all the scientists subscribe to the view ______ the increase in the earth’s temperature is due to the burning of fossil fuels to produce energy.

A. It;   \      B. As ;  that      C. It;  if    D. As;  whether

高二英语单项填空简单题查看答案及解析

Here's a new warning from health experts：sitting is deadly. Scientists are increasingly warning that sitting for long periods, even if you exercise regularly, could be bad for your health. And it doesn't matter where the sitting takes place—in the office, at school, in the car or before a computer or TV. Just the overall number of hours it takes counts. Several studies suggest people who spend most of their days sitting are more likely to be fat, have a heart attack or even die.

While health officials have issued (发布) guidelines advising on the least amounts of physical activity, they haven't suggested people try to limit how much time they spend in a seated position.

“After four hours of sitting, the body starts to send harmful signals，” said Ekblom­Bak of the Swedish School of Sport and Health Sciences. She explained that genes controlling the amount of glucose (葡萄糖) and fat in the body start to shut down.

Even for people who exercise, spending long periods of time sitting at a desk is still harmful. Tim Armstrong, a physical activity expert at the World Health Organization, said people who exercise every day but still spend a lot of time sitting might get more benefits if that exercise were spread across the day, rather than in a single hour.

Still in a study that tracked more than 17,000 Canadians for about a dozen years, researchers found people who sat more had a higher death risk, whether they exercised or not.

Experts said more research is needed to figure out just how much sitting is dangerous, and what might be possible to offset those effects.

“People should keep exercising because that has a lot of benefits，” Ekblom­Bak said. “And when they're in the office, they should try to interrupt sitting as often as possible. ”

1.The underlined word “offset” in Paragraph 6 most probably means “________”．

A. turn to　　 B. work out

C. get rid of　　 D. make use of

2.Sitting too much is dangerous because it can ______.

A. make a person unable to exercise enough in a day

B. destroy the balance of glucose and fat the body

C. increase glucose and fat in the body

D. make a person become lazy

3.In the opinion of Ekblom­Bak, when at work, you'd better have a rest by ________.

A. sending your friends e­mails

B. taking a walk around your office

C. chatting online or playing computer games

D. listening to music while sitting

4.Which of the following might be the best title for the passage?

A. Side Effects of Sitting Too Much

B. Don't Sit Too Much While Working

C. More and More People Sit Too Much

D. Sitting Too Much Could Be Dangerous

高二英语阅读理解中等难度题查看答案及解析

Some scientists say that animals in the oceans are increasingly threatened by noise pollution caused by human beings.

The noise that affects sea creatures comes from a number of human activities. It is caused mainly by industrial underwater explosions, ocean drilling, and ship engines. Such noises are added to natural sounds. These sounds include the breaking of ice fields, underwater earthquakes, and sounds made by animals themselves.

Decibels (分贝) measured in water are different from those measured on land. A noise of one hundred and twenty decibels on land causes pain to human ears. In water, a decibel level of one hundred and ninety-five would have the same effect.

Some scientists have suggested setting a noise limit of one hundred and twenty decibels in the oceans. They have observed that noises at that level can frighten and confuse whales (鲸).

A team of American and Canadian scientists discovered that louder noises can seriously injure some animals.

The research team found that powerful underwater explosions were causing whales in the area to lose their hearing. This seriously affected the whales’ ability to exchange information and find their way. Some of the whales even died. The explosions had caused their ears to bleed and become infected (被感染的).

Many researchers whose work depends on ocean sounds are against a limit of one hundred and twenty decibels. They say such a limit would mean an end to important industrial and scientific research.

Scientists do not know how much and what kinds of noises are harmful to ocean animals. However, many scientists don’t think that noise is a greater danger than they believed. They want to prevent noises from harming creatures in the ocean.

1.According to the passage, Which of the following is increasingly dangerous to sea creatures?

A. The sound of cars. 　　　　　　　　　　　 B. The sound of voices.

C. Man-made noise pollution. 　　　　　　 D. The sound of steps.

2.According to the passage, natural sounds include all of the following except ________.

A. sounds made by animals themselves

B. ocean drilling

C. underwater earthquakes

D. the breaking of ice fields

3.Which of the following is discussed in the third paragraph?

A. The same noise level produces a different effect on land and in the ocean.

B. Different places may have different types of noises.

C. The decibel is not a right unit (单位) for measuring underwater noise.

D. Different ocean animals may have different reactions to noises.

4.What can we learn about the whales from the passage?

A. They won’t be confused by noises.

B. They are deaf to noises.

C. Their ability to reproduce will be lowered by high-level noises.

D. Their hearing will be damaged by high-level noises.

高二英语阅读理解中等难度题查看答案及解析

Some scientists say that animals in the oceans are increasingly threatened by noise pollution caused by human beings.

The noise that affects sea creatures comes from a number of human activities. It is caused mainly by industrial underwater explosions, ocean drilling, and ship engines. Such noises are added to natural sounds. These sounds include the breaking of ice fields, underwater earthquakes, and sounds made by animals themselves.

Decibels (分贝) measured in water are different from those measured on land. A noise of one hundred and twenty decibels on land causes pain to human ears. In water, a decibel level of one hundred and ninety-five would have the same effect.

Some scientists have proposed setting a noise limit of one hundred and twenty decibels in oceans. They have observed that noises at that level can frighten and confuse whales.

A team of American and Canadian scientists discovered that louder noises can seriously injure some animals. The research team found that powerful underwater explosions were causing whales in the area to lose their hearing. This seriously affected the whales' ability to exchange information and find their way. Some of the whales even died. The explosions had caused their ears to bleed and become infected.

Many researchers whose work depends on ocean sounds object to a limit of one hundred and twenty decibels. They say such a limit would mean an end to important industrial and scientific research.

Scientists do not know how much and what kinds of noises are harmful to ocean animals. However, many scientists suspect that noise is a greater danger than they believed. They want to prevent noises from harming creatures in the ocean.

1. According to the passage, which of the following is increasingly dangerous to sea creatures?

2. Which of the following is discussed in the third paragraph?

3.As to the influence of noises on whales, which of the following statements is true?

4.According to the passage, what will scientists most probably do in the future?

高二英语阅读理解简单题查看答案及解析

Some scientists say that animals in the oceans are increasingly threatened by noise pollution caused by human beings.

The noise that affects sea creatures comes from a number of human activities. It is caused mainly by industrial underwater explosions, ocean drilling, and ship engines. Such noises are added to natural sounds. These sounds include the breaking of ice fields, underwater earthquakes, and sounds made by animals themselves.

Decibels (分贝) measured in water are different from those measured on land. A noise of one hundred and twenty decibels on land causes pain to human ears. In water, a decibel level of one hundred and ninety-five would have the same effect.

Some scientists have proposed setting a noise limit of one hundred and twenty decibels in oceans. They have observed that noises at that level can frighten and confuse whales.

A team of American and Canadian scientists discovered that louder noises can seriously injure some animals. The research team found that powerful underwater explosions were causing whales in the area to lose their hearing. This seriously affected the whales' ability to exchange information and find their way. Some of the whales even died. The explosions had caused their ears to bleed and become infected.

Many researchers whose work depends on ocean sounds are against a limit of one hundred and twenty decibels. They say such a limit would mean an end to important industrial and scientific research.

Scientists do not know how much and what kinds of noises are harmful to ocean animals. However, many scientists suspect that noise is a greater danger than they believed. They want to prevent noises from harming creatures in the ocean.

1.According to the passage, which of the following is increasingly dangerous to sea creatures?

A. The man-made noises.                  B. The noises made by themselves.

C. The sound of earthquakes.             D. The sound of the ice-breaking.

2.Which of the following is discussed in the third paragraph?

A. Different places with different types of noises.

B. The very human ears sensitive to all types of noises.

C. The same noise measured differently on land and in the ocean.

D. The ocean animals' reaction to noises.

3.As to the influence of noises on whales, which of the following statements is true?

A. They are deaf to noises.

B. Noises at a certain level may hurt them.

C. They are easily confused by noises.

D. Noises will limit their ability to reproduce.

4.We can know from the passage that many researchers think that the noise limit of one hundred twenty decibels would _____.

A. prevent them from doing their research work

B. benefit them a lot in their research work

C. do good to their health

D. increase the industrial output

5.According to the passage, what will scientists most probably do in the future?

A. They will try their best to decrease noise.

B. They will work hard to cut down noise pollution.

C. They will study the effect of different noises.

D. They will protect animals from harmful noises.

高二英语阅读理解中等难度题查看答案及解析

___ is known to us all is ____ the sun is bigger than the earth.

A It; that    B What ; that   C What ; how    D That; that

高二英语单项填空简单题查看答案及解析

The fact has worried many scientists________the earth is becoming warmer and wormer．

A．what                        B．that                          C．though                         D．which

高二英语单项填空简单题查看答案及解析

The earth is not the only body that travels around the sun. With it are eight other planets, fellow members of the sun’s family.

Two of them, Mercury (水星) and Venus, are nearer while the other six, namely Mars, Jupiter, Saturn, Uranus, Neptune and Pluto, also in their given order from the sun, are farther from the sun than the earth is. The farther they are, the longer trips they make around the sun. People noticed long ago that these traveling bodies moved around in the sky in definite paths. It is a force called gravity that holds them in their paths.

We know that every little bit of matter in the universe pulls upon every other bit of matter. The pull between two bodies is proportional (成比例的) to the product of their masses. Because the sun is so large the pull between the sun and the planets are thus great. If it were not for this pull, the planets would fly off into space. In the same way there exists a pull between the earth and the moon, which keeps the moon traveling in its orbit around our planet, the earth. Gravity holds you to its surface, and pulls back to it the ball which you throw into the air. Of course the ball also pulls on the larger earth but the earth is so much larger that the pull is not noticed.

Now remember that large bodies exert a greater pull than smaller ones which contain less material. But each object in the universe, no matter how small, pulls on all other objects to some degree.

1.There are ________ that travel around the sun in the sun’s family.

A．nine planets                           B．eight planets

C．one star and ten planets                  D．the earth and the sun

2.Which two planets make the longest trips around the sun among all the planets in the solar system?

A．Mercury and Venus.                     B．Neptune and Pluto.

C．Saturn and Uranus.                      D．Mars and Jupiter.

3.From the passage we can see__________

A．all the objects, big or small, must exert the same pull on one another

B．large objects exert the same pull on anybody as small objects

C．small objects exert the same on large ones

D．each object in the universe exerts a pull on all other objects

4.From the sentence “The pull between two bodies is proportional to the product of their masses.” We can infer that the pull between__________

A．the sun and the moon is greater than between the sun and the earth

B．the earth and the moon is greater than that between the sun and the earth

C．the sun and the earth is greater than that between the earth and the moon

D．the sun and the earth is the same as that between the earth and the moon

高二英语阅读理解中等难度题查看答案及解析