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几道有关“数词”的英语题,

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几道有关“数词”的英语题,
我有几道有关“数词”的英语题,不太懂,答案已经从参考答案里找出来了,不能确定一定是正确的,
1.The two great men wrote those letters in(C)
A.1870's B.1870s C.the 1870s D.the 1870
为什么1870后面要加s呢?
2.There are about two ( D ) students in the newly built school.
A.thousand B.thousands C.thousand of D.thousands of
为什么不能选A呢
3.I have worked for (B).I feel tired.
A.a hour and a half B.an hour and a half
C.one and a half hour D.an hour and a halves
为什么不选C呢?
几道有关“数词”的英语题,
1.The two great men wrote those letters in(C)
A.1870's B.1870s C.the 1870s D.the 1870
the 1870s表示18世纪70年代.一般年份前不加the等定冠词,后面也不跟别的,就in 1870就可以了.
2.There are about two ( D ) students in the newly built school.
A.thousand B.thousands C.thousand of D.thousands of
这个应该是A的,答案可能错了,thousands of 表示成千上万,前面不跟具体数字的.
3.I have worked for (B).I feel tired.
A.a hour and a half B.an hour and a half
C.one and a half hour D.an hour and a halves
表示1.5小时有2种方法:an hour and a half或one and a half hours
C项就是hour后面少了个s