第三部分：阅读理解（共20小题；每小题2分, 满分40分）
A
While all my classmates seem to be crazy about a one-way ticket to Mars (火星), I’d rather say Mars is totally unsuitable for human existence. People won’t have enough food supplies there, and the terrible environment would make it impossible for them to live a long life. Besides, the journey won’t be safe. Can anyone explain to me just why people go to Mars, never to return?
Steve Minear, UK
Here are things you can think of: the desire to explore a foreign and unique environment, the excitement of being the first humans to open up a new world, the expectation of fame and glory…For scientists there is another reason. Their observations and research will probably lead to great scientific achievements
Donal Trollop, Canada
There are too many people on the earth. I think that some time before the end of the century, there will be a human colony on Mars. It will happen when people realize that two-way trips to the red planet Mars are unnecessary. Most of the danger of space flight is in the launches (发射) and landings. Cutting the trip home would therefore reduce the danger of accidents, save a lot of money, and open the way to building an everlasting human settlement in another world.
Enough supplies can be sent on ahead. And every two years more supplies and more people will be sent to the new colony. Mars has all the material for a colony to produce or make everything it needs, and Mars is far more pleasant than the other planets in the outer space.
Paul Davies, USA
56．The main purpose of Steve Minear’s wring is ___________.
A．to report his classmates’ discussion     B．to invite an answer to his question
C．to explain the natural state of Mars    D．to show his agreement on going to Mars
57．Which of the following best states Donal Trollop’ idea?
A．There is a plan to send humans to Mars.
B．There are many reasons for going to Mars
C．Scientists become famous by doing research on Mars.
D．It is possible to build an Earth-like environment on Mars.
58．Paul Davies points out that _______.
A．humans need only a one-way ticket to Mars
B．two-way trips to Mars will be made safe soon.
C．it is easy to reduce the danger and cost of flights to Mars
D．It is cheap to build an everlasting human settlement on Mars
59．What does Paul Davies think of human existence on Mars?
A．Humans will have to bring all they need from the earth.
B．Humans will find Mars totally unsuitable for living.
C．Humans can produce everything they need.
D．Humans can live longer in the colony on Mars.