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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