单项选择题

A．"ups" and "down"
B．"goods" and "bads"
C．"pros" and "cons"
D．"highs" and "lows"
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单项选择题
A．watchfulB．readyC．alertD．attentive
A．watchful
B．ready
C．alert
D．attentive
单项选择题
A．whenB．howC．thatD．which
A．when
B．how
C．that
D．which
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