单项选择题

A．Because they had to control the spacecraft by hand.
B．Because the capsule was too heavy.
C．Because the capsule failed to separate from the spacecraft.
D．Because they couldn"t land.
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infections。[解析] 推断题。根据内容可知，如果缺乏维他命A会增加患病和感染致死的危险。空格中填入infections即可。
单项选择题
A．He couldn t get through the door of the spacecraft.B．The pressure inside the suit became greater than outside.C．He couldn t leave the capsule.D．He was going to die of oxygen starvation.
A．He couldn"t get through the door of the spacecraft.
B．The pressure inside the suit became greater than outside.
C．He couldn"t leave the capsule.
D．He was going to die of oxygen starvation.
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