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【参考答案】

requiring—required
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单项选择题
A．they are more responsibleB．they are more self-reliantC．they know how to workD．they are more sophisticated
A．they are more responsible
B．they are more self-reliant
C．they know how to work
D．they are more sophisticated
单项选择题
A．The spacecraft will fly direct to Mercury.B．The spacecraft will fly three times past Mercury.C．The spacecraft was launched a week later than planned.D．There is no specific task for this journey.
A．The spacecraft will fly direct to Mercury.
B．The spacecraft will fly three times past Mercury.
C．The spacecraft was launched a week later than planned.
D．There is no specific task for this journey.
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