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  3. It is hard to track the blue whale, the ocean’s largest creature which has a

It is hard to track the blue whale, the ocean’s largest creature which has a

游客2023-07-29  45
问题     It is hard to track the blue whale, the ocean’s largest creature which has almost been killed off by commercial whaling and is now listed as an endangered species. Attaching radio devices to it is difficult, and 【S1】______ sightings are too unreliable to give real 【S2】______ into its behavior.
    So biologists were delighted early this year when with the help of the Navy, they were able to 【S3】______ a particular blue whale for 43 days, monitoring its sounds. This was possible because of the Navy’s formerly top-secret system of under water listening devices spanning the oceans. Tracking whales is but one example of an exciting new world just opening to civilian scientists after the cold war as the Navy starts to share and partly 【S4】______ its global network of underwater listening system built over the decades to track the ships of 【S5】______ enemies.
    Earth scientists announced at a news conference recently that they had used the system for closely 【S6】______ a deep-sea volcanic eruption (爆发) for the first time.
    The speed of sound in water is 【S7】______ one mile a second—slower than through land but faster than through air. What is most important, different 【S8】______ of ocean water can act as channels for sounds, focusing them in the same way a stethoscope (听诊器) does when it 【S9】______ faint noises from a patient’s chest to a doctor’s ear. This focusing is the main reason that even 【S10】______ weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles.

A) layers            B) roughly           C) observation          D) monitoring
E) visual            F) uncover           G) discover             H) carries
I) relatively        J) visible           K) insight              L) examining  
M) potential         N) considerably      O) track [br] 【S4】
选项
答案 F
解析 从句子结构考虑应选择一个与share并列的动词原形。uncover是在动词cover (覆盖)的前面加前缀un-构成的一个动词，表示与该动词相反的动作，如：uncover (揭开，暴露)，unlock(开锁)，undress(脱衣服)，unsay(收回说过的话)等。故选项F为正确答案。
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