2．From Paragraph 2 we can conclude that ________.

　　A．the necessity of building the international space station is not realized now

　　B．many experiments have been done in the international space station

　　C．the international space station is necessary for people to explore space more

　　D．people have traveled to Mars from the international space station

　　答案与解析：C　推理判断题。根据第二段最后一句"In a word，if we want to explore space more, the first thing we should do is to set up a space station"可知国际空间站是进行太空探索所必需的。

　　3．Which of the following is not a reason for countries' cooperation in building the international space station?

　　A．That it requires a lot of money.

　　B．That it needs everyone's effort.

　　C．That it will benefit every participation country.

　　D．That it is too far away from the earth.

　　答案与解析：D　细节理解题。根据第三段第一句"As the space station costs a lot of money ..."和最后一句"It is really a job that needs everyone's effort and will benefit everyone"可知，A、B、C三项均提到了，而并没有提到D项。

　　4．The underlined word "aggregated" in Paragraph 3 can be replaced by ________.

　　A．united B．scolded

　　 C．allowed D．forbade

　　答案与解析：A　词义推测题。由该词所在的语境可知，发展国际空间站耗资巨大，因此美国联合其他一些国家共同来建设该工程，即该词意思相当于united。

　　B

Memory, they say, is a matter of practice and exercise. If you have the wish and really make a conscious effort, then you can quite easily improve your ability to