单项选择题

The weatherman broadcasts the ______ in temperature twice a day.

A．diversion
B．variation
C．variety
D．modification
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My brother's plans are very ______ ; he wants to master English, French and Spanish before he is sixteen.
A．arbitrary
B．aggressive
C．ambitious
D．abundant
单项选择题
______ many times, this radio receiver is found very sensitive.
A．Being tested
B．Having been tested
C．Having tested
D．Testing
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