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 oceans.

　　61. 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.

　　62. 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.

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