問題詳情


(B) Submersibles give us a close-up look at the ocean floor, but how do scientists measureocean depths, identify mountain ranges, and find deep-sea trenches? In the early days, sailorsmeasured ocean depths by lowering weights tied to a long piece of rope into the water. Thedepth was measured by noting how much of the rope was in the water when the weight hitthe bottom     Today, scientists are able to get a much better sense of what lies beneath the surface ofthe oceans. One technique they use is sonar. Sound waves are “bounced” off the ocean floor,and the time it takes them to return is measured. Another way scientists study the ocean flooris from the space. Just as ships use sound waves, satellites circling Earth bounce microwavesoff the ocean floor. These readings give a much more detailed picture of the oceans’geography, from subtle hills and valleys to hidden trenches.      Even with this modern technology, scientists have only just started to uncover thesecrets of the oceans. There are many more trenches to investigate, marine species todiscover, and mysteries of the oceans’ power to solve. Many exciting discoveries are aheadas we explore Earth’s watery frontier.
55. Which of the following sentences is FALSE?
(A) In the early days, sailors measured ocean depths by lowering weights tied to a longpiece of rope into the water.
(B) Another way scientists study the ocean floor is from the moon.
(C) Scientists have only just started to uncover the secrets of the oceans.
(D) Submersibles give us a close-up look at the ocean floor.

參考答案

答案：B
難度：適中0.5
統計：A(1),B(10),C(4),D(2),E(0)

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