填空题

People build ______to create big storage capacity and increase the speed of filling and emptying.

【参考答案】

flood-control dams
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单项选择题
A．He is satisfied with it.B．Not totally pleased.C．It’s not hard.D．He doesn’t like it.
A．He is satisfied with it.
B．Not totally pleased.
C．It’s not hard.
D．He doesn’t like it.
填空题
The fiver distance between Memphis and Vicksburg is shorten by______ because of the cutoffs.
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