单项选择题

A．They are going skiing.
B．Their plans include other friends.
C．They will drive together.
D．Their reservations have been canceled.
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单项选择题
A．Lack of electricity.B．Shortage of books.C．Lack of clean water.D．Shortage of experts.
A．Lack of electricity.
B．Shortage of books.
C．Lack of clean water.
D．Shortage of experts.
填空题
People build ______to create big storage capacity and increase the speed of filling and emptying.
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