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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.
【C5】
选项 A、similar
B、exact
C、regular
D、different
答案D
解析 由下文提到的不同的灯塔闪烁的次数不同可以判断D项different用在本句意思最为确切，A项similar(相似的)与下文相矛盾，B项exact“确切的；精密的”与句意不符。C项regular意为“有规律的”，这也与下文的意思不相符。
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