单项选择题

A．Final examination.
B．Summer plan.
C．Family education.
D．Historic places.
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单项选择题
A．Curious.B．Lazy.C．Cautious.D．Cowardly.
A．Curious.
B．Lazy.
C．Cautious.
D．Cowardly.
填空题
A variety of gases trapped in the Earth’s atmosphere can ensure life on Earth because they are ______.
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