Students ______ remain in their seats until all the exam papers have been collected.
A．must
B．shall
C．may
D．can
答案：B
考查情态动词shall的用法。Shall用于二三人称时表示一种语气，如命令、允诺、规定、警告等等。句意：学生们要保持坐在自己的座位上直到所有的试卷被收齐。Shall在这里表示一种规定。所以选B。
| 完形填空。 |
| I don't know the city at 1 and what is more, I couldn't speak a word of the language. After having spent my first day sightseeing 2 the town-center, I decided to lose my 3 deliberately (深思的) on my second 4 , since I believed 5 this was the surest way of getting to know my way around. I got on the first bus that 6 and descended (下来) some thirty minutes later in what must have been a suburb. The first two hours passed pleasantly 7 . I discovered mysterious little bookshops in back 8 and finally arrived at a marketplace 9 I stopped and had a coffee in an open-air cafe. Then I decided to get 10 to my hotel for lunch. Ham was the eighty-sixth living creature shot into the space by U.S. scientists. Before him, rockets had taken up sixty-six mice, two frogs, two rabbits, eleven dogs, 11 four monkeys. Even the mice were 12 in small space suits. All were fitted 13 recording machines that told how their journeys in 14 bad affected them. But Ham's 15 was the most important. The chimpanzee's (黑猩猩) would tell the most 16 how a human astronaunt might react in space. And Ham had been especially trained to 17 all the actions that would make a 18 of how a clever creature would 19 in space. He had been trained for all the things he might 12 to on the flight-dimlight (昏暗的光线), great noise, greater speed. |
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