单项选择题

A．To concentrate on the mind, forgetting everything around.
B．To concentrate on the tea, enjoying its flavor.
C．To concentrate on the present, forgetting the past and future.
D．To concentrate on the mind, foreseeing the future.
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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.
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.
填空题
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。
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