句型转换。

1.Our pants are 56 yuan. (对画线部分提问)

    _______ _______ are your pants?

2.Mary has an eraser. (改为一般疑问句)

    _______ Mary ______  an eraser?

3.How do you like the shirt ?(改为同义句)

    _______ do you _______ the shirt ?

4.What time is it now?(改为同义句)

    What _______ the _______ now?

5.Tom has some nice photos .(改为否定句)

     Tom  _______  _______ any nice photos.

向洗涤液内补充的碱液浓度为（）%。

A.10

B.20

C.30

D.40