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问题 单项选择题

中印两国以喜马拉雅山为界，其界线是（）。

A.确定边界线

B.传统边界线

C.无形边界线

D.自然边界线

答案

参考答案：B

解答题

①由x2-196=0可得______．

②据①得，x是196的______，所以x=______．

由①，②的启示，请你试着求等式16（x+2）2-81=0中的x值．
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选择题
—I haven't seen your sister for a long time.
—She _______ Beijing on business for a month.

A. went to
B. has gone to
C. has been to
D. has been in
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