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  3. The safety of ships at sea does not depend only on the arrangements made in the ships themselves. Dangerous coasts and rocks may

The safety of ships at sea does not depend only on the arrangements made in the ships themselves. Dangerous coasts and rocks may

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问题     The safety of ships at sea does not depend only on the arrangements made in the ships themselves. Dangerous coasts and rocks may be seen in the daytime,【C1】______they are a threat to safe navigation at night. Lighthouses are therefore erected at such places to【C2】______sailors of the danger. Modern lighthouses are put up at all dangerous places near the courses【C3】______by ships. On some rocky coasts several lighthouses may be built not far from each other, and【C4】______the sailors on a ship may know which is which, they have【C5】______arrangements of lights. One lighthouse will give a single flash at regular【C6】______, another may give two flashes; a third may give two followed by one; and so on. 【C7】______watching the lights the navigator is able to decide exactly where he is, and he can set his 【C8】______with confidence. In the approaches to some ports two continuous lights are set up, one above【C9】______but some distance behind; when they appear from the sea one above the other, the ship is on the right course; but if they do not, the captain knows that he is【C10】______his course and likely to strike a rock or the bottom of the sea.
【C7】
选项 A、On
B、After
C、With
D、By
答案D
解析 根据句意，本题应选择一个表示方法、手段的介词，D项By意为“靠；通过”，符合句意，因此是正确答案。A项On后接动名词时表示时间，意为“在……后立即”；B项After也表示时间，它们均与句意不太相符；C项With不可直接接动名词，因而不可用在本句。
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