单项选择题

A．Lack of electricity.
B．Shortage of books.
C．Lack of clean water.
D．Shortage of experts.
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填空题
People build ______to create big storage capacity and increase the speed of filling and emptying.
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.
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