The earth can （)enough food to supprot at least twice is present population.

Nowadays two thirds of all liver-transplant can live__________

A．not long enough to get out the hospital.

B．about one year.

C．at least one year.

D．less than one year.

听力原文：W: Why is there never a bus when you want one？

M: Good question. There aren't enough buses on this route.

W: Sometimes I feel like writing a letter to the paper.

M: Good idea. You should say that we need more subway lines, too.

W: Yeah. There should be more public transportation in general.

M: And fewer cars! There's too much traffic.

W: Say, is that our bus coming？

M: Yes, it is. But look. It's full!

W: Oh, no ! Let's go and get a cup of coffee. We can talk about this letter I'm going to write.

Where does this conversation probably take place？

A．At a bus stop.

B．In a newspaper office.

C．In a coffee shop.

A.may be lonely

B.can not conquer their fears

C.will keep in touch with the earth

D.can not have connection with the earth

From the passage, we can know that ______.

A．20-25% of earth's 6 billion people can use American English

B．20-25% of earth's 6 billion people can use Dr. Johnson's English

C．20-25% of earth's 6 billion people can use standard English

D．20-25% of earth's 6 billion people can use English though not idiomatic

The theory about a Snowball Earth is significant in that it can ______.

A．decode the mystery of life

B．predict the formation of a new supercontinent

C．adjust the planet's climate

D．prevent another Snowball Earth from happening