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问题
填空题
一个两位数,个位上的数字是7,十位上是4,这个数是( )。
答案
47
选择题
Gun control is a subject _____ Americans have argued for a long time.
A. of which
B. with which
C. about which
D. into which
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单项选择题
-8,15,39,65,94,128,170,()。
A.180
B.210
C.225
D.256
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