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.

　　65. 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.

　　66. 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.

　　67. We can know from the passage that many scientists 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

　　68. 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.

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