要能选择一个好的课题，必须完成哪几方面的工作？

下列关于中药害虫趋性的叙述，正确的是（）

A.趋光性

B.趋热性

C.趋雨性

D.趋风性

E.趋湿性

句型转换(每小题2分，共10分)

小题1: You go to the party. You have a good time. (改为条件状语从句)

______ you go to the party , you ______ have a good time .

小题2:Pour the milk into the blender, Lily. (改为否定句)

__________ _________ the milk into the blender, Lily.

小题3:His mother doesn’t mind soap operas.(对画线提问) 

________ does his mother ______ of soap operas?

小题4:The man is very weak. He can’t carry the bag. (改为同义句)

The man is ________ weak ________ carry the bag.

小题5:I’m going to stay at home. (改为一般疑问句)

_______ you _____ to stay at home?

境外上市外资股以外币标明面值，以外币认购。

某物体的质量为1000kg，则其重量为（）。

A.1000N

B.9810N

C.9810kgf

D.1000/9.81kgf

变压器大修检查铁心时应注意什么问题？