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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
admin
2015-09-30
33
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.
【C6】
选项
A、distances
B、gaps
C、intervals
D、length
答案
C
解析
A项distances指“距离”,在与介词at搭配时通常是at a distance of…“在……的距离处”,但不能用于at distances,也不与regular搭配,因此A项不正确。B项gaps意为“间隔,间隙”,不能与at搭配。D项length意为“长,长度”,at length是习语,意为“最后,终于”,但length也不能与regular搭配。因此只有C项intervals合适,是正确答案。interval意为“间隔”,at intervals意为“不时;每隔……时间”。本句中的at regular intervals指“定期”。
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