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问题 单项选择题

一堆沙重480吨，用5辆载重相同的汽车运3次，完成厂运输任务的25%，余下的沙由9辆同样的汽车来运，还需几次可以运完( )

A．4次

B．5次

C．6次

D．7次

答案

参考答案：B

解析：每辆汽车每次运的量为480×25%÷5÷3＝8吨，则剩下的需要运的次数为480×(1-25%)÷9÷8＝5次，故选Bo

填空题



Earthquakes often happen near volcanoes, but this is not always true. The centers of some are (1) . The bottom of the sea suddenly (2) . The powerful forces inside the (3) break the rocks. The coast is shaken and great waves appear. These waves travel (4) and rush over the land when they reach it. They are p enough to (5) houses and other buildings; sometimes they break (6) than the earthquake itself.
Very often fires followed the (7) earthquakes. In 1906, the great earthquake at San Francisco broke the gas-pipes. The gas (8) , and soon large numbers of fires were burning in the city. The water-pipes were also (9) ; so it was not possible to put the fires out. There was (10) . The Tokyo earthquake of (11) happened just before the middle of the day. People were (12) on their fires at that time. When the ground shook, the fires shook too. (13) were thrown on the different parts of the houses, some of which were (14) . Soon 134 fires were burning in the city. What kind of building (15) in an earthquake A building with concrete walls is perhaps the best. A (16) will make it even per. The frame holds the (17) together, and the walls do not easily fall. There is (18) of fire because concrete and steel do not burn. The Americans (19) the results of the earthquake in San Francisco, and they are convinced that this kind of building is the (20) .
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多项选择题

我国保险公司把国际海洋运输货物的保险险别分为平安险、水渍险和一切险三种基本险别。下列属于平安险保险范围的有( )。

A．某批进口货物在卸货过程中有两箱货物落人海中，造成货物灭失

B．某批出口货物在装卸过程中，工人使用吊车时不小心将货物包装钩破，造成货物损失

C．某国际航行船舶在驶往国外途中着火，部分货物灭失

D．某载运国际运输货物的船舶在驶往某国的途中触礁沉没，货物灭失
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