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
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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
单项选择题
Professor White, I would feel very ______ if you could give some advice about my thesis.
A．honorable
B．appreciable
C．obliged
D．relieved
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