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单项选择题

A. The lack of air pressure. C. Exposure to radiation.
B. The extremely hot or cold temperature. D. An inadequately ventilated space suit.
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单项选择题A. In the third room on the right. C. In a room at this end. B. In the Common Room. D. In Room 501.

A. In the third room on the right. C. In a room at this end.
B. In the Common Room. D. In Room 501.

单项选择题A. At midnight. C. When the neighbors’ son leaves for work. B. In the morning. D. When the car is turned off.

A. At midnight. C. When the neighbors’ son leaves for work.
B. In the morning. D. When the car is turned off.