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Computers cannot completely take the place of(D)

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Computers cannot completely take the place of(D)
A.peoples B.a man C.people D.humans为什么选D,这几个选项有什么区别?
In the meeting-room the scientist was giving a talk on space in (C)
A.China B.American C.French D.British为什么选C?
a large number of 与a large amount of 的区别.
(B)came that I was wanted at the office.
A.A news B.Word C.Talk D.Words为什么选B?
1.people加s是民族的意思
a man一个人
people人们
humans人类
有选项可知,此项应填全体人类
2.这句话:在会议室科学家用法语做关于太空的报告
只有C表示语言
3.前者加可数名词,后者加不可数名词
4.前面不加冠词,这是固定用法