句型转换 (每空1分，共10分)

小题1:There are some vegetables for dinner. （改为否定句）

There _______  ________ vegetables for dinner.

小题2:How’s the weather in Beijing. (同义句转换)

_________ the weather ________ in Beijing.

小题3:The students are having an English class . （对画线部分提问）

_________ are the students ____________?

小题4:Your brother has a great time playing computer games. (同义句转换)

Your brother has ________ _________ computer games.

小题5: No photos here. (同义句)

_____________ ____________ any photos here.

“电介质偶极子内的正负电荷随着电流正负半周的高速变化，也不断反复取向而产生180°的旋转，偶极子内束缚电荷位置移动”产生（）

A.涡电流

B.位移电流

C.介质损耗

D.欧姆损耗

E.非热效应