在金-瓷冠桥修复体中，若金-瓷热膨胀系数不匹配，会造成 A．烤瓷冠颜色改变 B．烤瓷

若虫：由蝗虫的                      孵出的                     ，形态和                     与                     相似，只是身体                       、                      没有发育成熟，仅有                     ，能够                     ，称为                       ，这样的                     叫做若虫。

．—Where did you go last weekend?

—ChenDu, we got to the station almost half an hour earlier than the bus.

—So you _______ in such hurry.

A．needn’t have been

B．couldn’t have been

C．shouldn’t have been

D．mustn’t have been

按要求改写句子。

1. I like this new watch. (改写为一般疑问句)

     _________ _________ like this new watch?

2. He has a basketball.(改写为否定句)

    He _________ _________ a basketball.

3. She has a new volleyball.(改写为一般疑问句)

     _________ she _________ a new volleyball?

4. He has some interesting collections.(就画线部分提问)

    _________ he _________?

5. Do you play basketball? (作否定回答)

   _________, I _________.

电压继电器可用于电动机的欠压保护和制动，以及反转控制等。

农田水利包括（）等工作。

A.农田改造

B.排涝

C.土壤改良

D.灌溉

E.水土保持