问答题
Hopefully,__________(新的大坝能在每个夏天防止河水泛滥).
【参考答案】
the new dam will be of help to keeping the river from floodi......
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填空题
A.atB.inC.withoutD.through
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单项选择题
The author suggests that the main impact that gene transfer between crops and weeds could have is ______.
A.the collapse of the agricultural industry
B.the rapid development of unintended plant hybrids
C.the development of pest and herbicide-resistant weeds
D.the difficulty to determine whether to make crops resistant to pests or not given the limited nature of current research
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