题目内容：

    Do astronauts get space sick when they travel from Earth to the International Space Station (ISS)? Yes, astronauts can get space sick travelling to the ISS. It is less likely travelling in the cramped (拥挤的) Russian Soyuz spacecraft used to transport astronauts there now, than the old Space Shuttle that was used until 2011. The ability to move around in the Space Shuttle increased the chance of space sickness happening.

As you probably know, gravity is lower inside the ISS. The low gravity in space allows astronauts to float around, which looks like fun, but it can help cause space sickness.

Recent experiments show that space sickness is related to our inner ear. Two separate parts of the inner ear respond to sudden changes in direction. If you shake or move your head very quickly, you can get dizzy. However, this normally passes very quickly. This normal response is upset under low gravity: your inner ear thinks you are constantly moving. It takes some time to adapt to the new condition of weightlessness. It is made worse if you move your head while your body is still adapting. This is why previous astronauts travelling in the larger Space Shuttle were likely to suffer from space sickness more than the current astronauts travelling in the cramped Soyuz spacecraft. The astronauts were less likely to move their heads around very much in a narrow space.

Space sickness was not talked about in the early space missions (任务).The original Mercury and Gemini spacecraft were, like the current Soyuz, cramped. The astronauts were less likely to get sick, so space sickness no longer became a concern of NASA.

In 1983 the first detailed study was carried out aboard a Space Shuttle flight (STS-7) by astronaut-doctor Norm Thagard. His and all later studies were hampered by the astronauts themselves. None of them wanted admit to being space sick. They were worried that mission control might remove them from space walking opportunities, or even worse, that they might not get included on later space missions.

1.What was the problem with the Space Shuttle?

A.It was too slow.

B.It was too small.

C.It broke down often.

D.It had too much space.

2.How does low gravity hurt astronauts?

A.It fools their inner ear.

B.It causes pain in their head.

C.It stops them shaking their head.

D.It prevents them measuring their weight.

3.Why wasn’t NASA worried about space sickness until later missions?

A.The condition had been kept secret to the public.

B.There were few detailed studies on it.

C.The old spacecraft were better equipped.

D.The astronauts were less likely to get sick.

4.What does the underlined word “hampered” in the last paragraph mean?

A.Changed. B.Improved.

C.Blocked. D.Compared.