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问题 选择题
不改变分式的值，下列变形正确的（　　）
A．
a
b
=-
-a
-b
B．
-a
b
=-
a
-b
C．
a
-b
=-
a
b
D．-
-a
-b
=
b
a
答案

A、应该是

a
b
=
-a
-b
．故本选项错误；

B、应该是

-a
b
=
a
-b
．故本选项错误；

C、

a
-b
=-
a
b
．故本选项正确；

D、应该是-

-a
-b
=-
b
a
．故本选项错误．

故选C．

选择题

The urge to go abroad for further study is strong, but it was not until last summer ________ I knew how powerful it could be.

A．who　

B．that

C．where　

D．before
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多项选择题

下列各项中，能够引起诉讼时效期间中断的法定事由包括( )。

A．权利人提起诉讼

B．不可抗力

C．当事人一方同意履行义务

D．诉讼时效期间届满，法院决定延长
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