—I talked with a foreigner for a long time yesterday.

—Great! It’s a good ____________ to practice English.

A. habit B. chance C. skill D. exercise

B 【解析】試題句意：--我昨天和外國人聊了一段時間。--好的！那是練習(xí)英語的好機(jī)會。A.習(xí)慣； B.機(jī)會； C.技能； D.練習(xí)。根據(jù)句意可知，是機(jī)會。故選B。
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Some scientists say that animals in the ocean are

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human beings. The noise that influences sea animals comes

from a number of human activities. It is caused mainly by

industrial underwater explosions(爆炸) , 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 (分貝) 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（效果）.

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

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.

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. It’s time for them to take action to help ocean animals.

1.Which of the following is not caused by human beings?

A. The noise of industrial underwater explosions.

B. The noise of ocean drilling.

C. The sound of underwater earthquakes

D. The noise of ship engines.

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B. Different places may have different types of noises.

C. The noises can cause humans to lose hearing.

D. There are different kinds of natural sounds in the ocean.

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A. Powerful underwater explosions aren’t harmful to whales’ ears.

B. Many researchers are against the noise limit of 120 decibels.

C. Noises cannot cause whales’ death.

D. The noise limit of 120 decibels would hardly influence the industrial research.

4.According to the passage, we can infer that scientists will probably .

A. work hard to cut down natural sounds.

B. stop industrial and scientific research in oceans.

C. try their best to make no noise.

D. protect ocean animals from harmful noises.

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