Ifwesunlightadryleafwithapiece

If we_________ sunlight_________ a dry leaf with a piece of glass, it may start burning.

A．work; out

B．carry; out

C．focus; on

D．concentrate; on

登录免费查看答案和解析

相关试题

You can never imagine what great difficulty I have _____ your house.

A．found

B．finding

C．to find

D．for finding

收藏答案/解析

Before he went abroad, he spent as much time as he ____ English.

A．could learning

B．learned

C．to learn

D．could learn

收藏答案/解析

Mr. Wang made up his mind to devote all he could ____ his oral English before going abroad.

A．improve

B．to improve

C．improving

D．to improving

收藏答案/解析

It was quite a serious accident, _________ caused by careless driving.

A．which I think was	B．I think which was
C．which I think it was	D．I think which it was

收藏答案/解析

Jane was disappointed that most of the guests______ when she_______at the party.

A．left; had arrived	B．left; arrived
C．had left; had arrived	D．had left; arrived

收藏答案/解析