英语谜语

1. A cat, eyes like a cat, a tail (尾巴) like a cat, but isn't a cat? _________

2. What is in the center (中心) of the water? _________

3. Two little brothers, One lives (居住) on one side (边).

    The other on the other side. They hear (听见) what you say (说),

    but they do not see (看) each other. (互相) _________

违约责任是当事人不履行合同义务或者履行义务不符合约定条件而应承担的民事责任。违约行为包括：( )。

A．履行拒绝

B．履行不能

C．履行迟延

D．履行适当

E．履行不当