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A、Less energy for locating food. B、Decreased communication area. C、Incapability of sending calls. D、Serious water pollution in t
A、Less energy for locating food. B、Decreased communication area. C、Incapability of sending calls. D、Serious water pollution in t
admin
2012-07-05
61
问题
(26) If a noisy neighbor is blasting music at all hours of the day and night, drowning out your phone conversations and interrupting your sleep, you can call the police. But what is a whale to do?
Natural noise from waves, wind, rain and even earthquakes is common in oceans. Unfortunately, man-made noise from oil and gas drilling, sonar, and ships is also present.
(27) Low frequency noise has doubled off the California coast every decade since the 1960s. Most of them are ships’ engines. They not only generate continuous low frequency sound, but also create air bubbles that collapse , creating loud popping sounds.
Whales use low frequency calls to communicate across thousands of miles of ocean. They are threatened by noise pollution because it can prevent them from contacting each other and from locating food. Right whales are the most at risk.
Scientists studying right whales off Canada’s east coast have discovered that whales are sending louder calls through the water to make themselves heard. Because they invest more energy in making calls, they have less energy available for finding food and mating. (28) Other scientists measuring whale calls against background noise pollution have discovered that right whales have lost about eighty percent of their normal communication area. This could seriously affect survival of this already threatened species.
Scientists don’t have badges and guns, but they are trying to correct the noise pollution problem. (29) By tracking ships and marine mammals and understanding how noise travels, they are creating sound maps.
26. What is the main topic of this passage?
27. What is the main cause of low frequency noise off the California coast?
28. What could seriously affect survival of the right whales?
29. What measures will be taken for the noise pollution problem?
选项
A、Less energy for locating food.
B、Decreased communication area.
C、Incapability of sending calls.
D、Serious water pollution in the oceans.
答案
B
解析
题干询问什么会严重影响到露脊鲸的生存。短文中提到,由于噪声污染的原因,露脊鲸已经丧失了约80%的可沟通空间,而这一点已经严重影响了它们的存活,故答案为B)。
转载请注明原文地址:https://kaotiyun.com/show/W657777K
0
大学英语四级
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