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问题
填空题
如果(m﹣5)x
|m﹣2|
y
3
是关于x,y的六次单项式,那么m=( ).
答案
﹣1
单项选择题
建设单位与施工单位因承包合同争议提起诉讼的,诉讼时效期限为()年。
A.1
B.2
C.3
D.4
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选择题
There _____ many kinds of birds around here, but now we seldom see them because of the air pollution.
A. had
B. used to have
C. used to be
D. are
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