单项选择题

A．take
B．change
C．produce
D．lose
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单项选择题
A．essentialB．excellentC．unusualD．critical
A．essential
B．excellent
C．unusual
D．critical
单项选择题
A．In additionB．In contrastC．HoweverD．Therefore
A．In addition
B．In contrast
C．However
D．Therefore
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