填空题

The arduous task________________________(需要我们作出很大的努力).

【参考答案】

The arduous task requires great efforts of us.
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填空题
Dr.Marzluff is the first scientist to carry out the formal study of human recognition in wild birds.
单项选择题
A．similarB．differentC．flexibleD．identical
A．similar
B．different
C．flexible
D．identical
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