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问题 选择题

安哥拉长毛兔最细的兔毛半径约为2.5×10-6米，这个数用小数表示为 [ ]

A．0.0000025米

B．0.0000205米

C．0.0000250米

D．0.00000025米

答案

答案：A

解答题
1
8
+0.375=		2.8÷0.7=
3
4
×0.8=
7-3
2
5
=		(
1
3
-
1
7
)×21=		0.04÷0.09=
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选择题

In spite of these unexpected difficulties, the Chinese scientists ________ to carry out their experiments

on the lonely island. [    ]

A. threatened  

B. managed

C. offered  

D. hesitated
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