题目内容：

The plan: turn Mars into a blue world with streams and green fields, and then fill it with creatures (生物) from the earth.

This idea may sound like something from a science fiction (科幻小说), but it is actually being taken seriously by many researchers. This suggests the future for the "red planet" will be the main topic for discussion at an international conference hosted by NASA (美国宇航局) this week. Leading researchers as well as science fiction writers will attend the event.

Turning Mars into a little earth has long been a topic in science fiction,” said Dr Michael Meyer, NASA's senior scientist for astrobiology (太空生物学)．“Now, with scientists exploring the reality, we can ask what are the real possibilities of changing Mars.”

Most scientists agree that Mars could be turned into a little earth, although much time and money would be needed to achieve this goal.

But many experts are shocked by the idea. "We are destroying our own world at an unbelievable speed and now we are talking about ruining another planet," said Paul Murdin from the Institute of Astronomy, Cambridge, UK.

Over the past months, scientists have become increasingly confident .They will find Martian life forms. Europe and America's robot explorers have found proof that water, mixed with soil, exists in large amounts on the planet.

1.The passage is about________.

A. Mars supporting life

B. finding water in the Mars

C. a plan turning Mars into a little earth

D. the necessity of changing Mars

2.Those who agree to turn Mars into a little earth______.

A. are short of confidence

B. will gain the support of NASA

C. are asking for advice on how to carry it out

D. realize that it’s not easy to achieve their goal

3.What’s Paul Murdin’s attitude to the plan?

A. He is for the idea.

B. He is active in the idea.

C. He is against the idea.

D. He doesn’t care about it.

4.What can we know about the scientists from the last paragraph?

A. They have no idea about the plan.

B. They will find Martian lives very soon.

C. They may achieve their goals some day.

D. They have found much proof of Martian lives.