A．Their lack of concentration resulting from menta

单项选择题

A．Their lack of concentration resulting from mental stress.
B．The lack of consideration for them in equipment design.
C．The probability of their getting excited easily.
D．Their slowness in responding.

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问答题 The visitors will be in awe of American landscape for its__________.

单项选择题 The author argues that, in describing American culture during the Colonial and Revolutionary eras, historians ______.

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