根据听力内容选出正确答案。[音频]

A. You're welcome.
B. I'm very pleased.
C. It's my pleasure.
D. Not at all.

根据听力内容选出正确答案。[音频]

A. Let's go out.
B. We plan to have a yare sale in the neighborhood.
C. We can have a picnic.
D. Sorry, I am busy.

根据听力内容选出正确答案。[音频]

A. I will
B. Thank you
C. No problem
D. Of course

根据听力内容选出正确答案。[音频]

A. Please forgive me.
B. That's all right.
C. I could.
D. OK

根据听力内容选出正确答案。[音频]

A. I'll drive to work everyday.
B. I'll ride my bike more.
C. I'll buy goods shipped from afar.
D. I'll make holiday in faraway places.

[音频]Man has been polluting the earth from the time he first made fire, washed his clothes in the river and threw his waste on the ground. When land was used up or water became (1)______ , man moved on to another place. At first it was all right because there was plenty of clean air, land and (2)_______ . And there were (3)_______ people. But the growing population and modern industry have changed the situation. Today, pollution has brought serious (4)______ to our health and life.