单项选择题

A．The man is waiting to be checked.
B．The man is asking the key to his room.
C．The man is asking the bellman to help his bags upstairs.
D．The man is asking a room to live in.
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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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is→are
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