I am very keen at plants,______？A．isn"t IB．ain"t IC．am ID．aren"t I

We thought______.

A．wrong not to tell him it

B．it not to tell him wrong

C．it wrong to not tell him

D．it wrong not to tell him

请帮忙给出正确答案和分析，谢谢！

That is______.

A．where lived he there

B．where did he live

C．where he lived

D．that where he lived

请帮忙给出正确答案和分析，谢谢！

What is the main cause for dropping the former EPA standard?

A．The danger of premature death.

B．The protest from the smog victims.

C．The disapproval of the White House.

D．The protest from Green Peace groups.

请帮忙给出正确答案和分析，谢谢！

What is the topic of the news?

A．Air pollution.

B．Medicare in the U. S..

C．The component of smog.

D．Protection of environment.

请帮忙给出正确答案和分析，谢谢！