of the earth"s gravity,an astronaut is affected by still another problem——weight-lessness.Here,if a pencil drops,it does not fall.If a glass of water is turned upside down,the water will not fall out.Our bodies,which are accustomed to gravity,tend to become upset in weightless conditions.Recent long flights have shown that the body needs special execise in a spaceship.
Astronauts could also be affected by boredom and loneliness.Some of them might have to sit in their spaceships for nonths with little to do and no one to talkto.Space trips to distant planets or the nearest stars mighttake many years.It is possible that some trips to even take a lifetime.So future astronauts must be trained to endure ling periods of "inactivity and solitude".
6. Which of the following is NOTmentioned in the passage?
a.The earth"s gravity b.Weightlessness c.Space sickness d.Loneliness
答案： c
解析： 第二、三、四段的首句分别提到了a，b，d三个选项。
7. In weightless condition,what will happen?
a.If a pencil drops,it will fall b.If a glass of water is turned upside down,the water will fall out
c.Our bodies tend to become upset d.It"s easier for our bodies to move around
答案： d
解析： 第三段中间分别列举了在失重情况下的三种可能性。
8. The quality that the future astronauts must have is_____.
a.being brave b.not being overweight c.enduring solitude d.being passive
答案： c
解析： 第四段最后一句话提到未来的宇航员接受训练，以便能经受住长期不运动和寂寞的考验。
9. Which of the following is beyond the gravity of the earth?
a.A pencil b.An animal c.A man on the earth d.A man in a rocket moving3,000miles per hour
答案： d
解析： 第一段的最后一句说，火箭以每小时至少2，500英里的速度飞行时，能使人摆脱地球重力。所以，火箭以每小时3，000英里运行时，人在火箭里是不受地球引力影响的。
10. When a rocket leaves the ground,the gravity_____.
a.is equal to the normal one
b.is less strong than the normal one
c.is much stronger than the normal one
d.is relatively smaller
答案： c
解析： 第二段最后一句提到，火箭飞离地面时，施加在人身上的重力相当于正常时的九倍，也就是说，火箭飞离地面时，施加在人身上的重力会更大。
PART TWO
Ⅲ.用国际音标标出下列单词划线字母或字母组合的读音。
1.should 2.future 3.group 4.tooth 5.decision
6.vision 7.occasion& |
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