单项选择题

Passage One Questions 26 to 29 are based on the passage you have just heard.

A．Its chemical elements must be studied.
B．Its temperature must be lowered.
C．Big spaceships must be built.
D．Its atmosphere must be changed.
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单项选择题
A．He plans to sell the books to a collector.B．The old books are worth a lot to collectors.C．He won’t sell the books until he has read them.D．The books probably aren’t worth much in terms of money.
A．He plans to sell the books to a collector.
B．The old books are worth a lot to collectors.
C．He won’t sell the books until he has read them.
D．The books probably aren’t worth much in terms of money.
填空题
B
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