单项选择题


A．undermined
B．eliminated
C．boosted
D．underlined
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A．leastB．thenC．lastD．latter
A．least
B．then
C．last
D．latter
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What does the passage mainly discuss
A．The experiments on the common cold.
B．The myths about the common cold.
C．An explanation of why and how people catch colds.
D．The continued spread of the common cold.
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