填空题

Based on an analysis of a meteorite, ______ (科学家们认为火星存在生命).

【参考答案】

scientists argue for life on the Red Planet
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单项选择题
A．He is a Marathon sportsman.B．He is an amateur Marathon sportsman.C．He is race lover.D．He will attend 10-mile race.
A．He is a Marathon sportsman.
B．He is an amateur Marathon sportsman.
C．He is race lover.
D．He will attend 10-mile race.
填空题
The study of evolutionary change is vital to understanding how organisms change over time ______ (在生物适应性和遗传两个方面).
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