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问题
判断题
人口总数是在一定时间、区域内的全部人口数。
答案
参考答案:
错
选择题
一 We've spent too much money recently.
一 Well, it isn't surprising. Our friends and relatives _____ around all the time.
A. are coming
B. had come
C. were coming
D. have been coming
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单项选择题
按植物学定义,只要和地表接近,生长高度在()60公分以下的草本植物均属于地被。
A.40公分
B.50公分
C.60公分
D.70公分
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