With the growing population on earth，it becomes more and more difficult for the planet to hold so many people.All the countries are looking for a way out.It seems that the powerful counties all agree on one possible solution：space colonization （殖民）.
   America is one of the most powerful countries in space science.The American scientists believes it is necessary to build a base on the moon.It is very likely to be built where there is ice.The only problem is its cost.
   Although Russia is not as strong as America in space power for the time being，with a lot of knowledge and experience from the former Soviet Union （前蘇聯），many scientists think that it is just a matter of time for the Russians to land on the moon，or even the Mars.
   China has made big progress in space exploration in the last twenty years.Great success has been achieved with the Shenzhou spaceships.China's Lunar Exploration Project has completed its first two steps and is now going to the last one：to build a base on the moon.
   Besides，India is believed to be the next "China" in the area due to its quick development in the field.

（1）What does the underlined word "necessary" mean？

A

A

A．必要的
B．荒謬的
C．困難的
D．冒險的
（2）Why do many scientists think Russians will land on the moon？

B

B

A．All the countries are looking for a way out.
B．Russia has a lot of knowledge and experience.
C．Russia is not as strong as America in space power.
D．Russia has made great progress in space exploration.
（3）How many countries are mentioned in the passage？

D

D

A．One.
B．Two.
C．Three.
D．Four.