单项选择题

A headache for the government is how to solve the problem of nationwide labour ______.

A．sufficiency
B．abundance
C．extra
D．surplus
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单项选择题
Cellular phones are wireless mobile phones that ______ and receive computer-controlled radio signals.
A．transmit
B．give off
C．dispatch
D．launch
单项选择题
What ______ do we need for this kind of cake besides sugar and flour
A．elements
B．contents
C．ingredients
D．components
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