单项选择题

if you keep getting wrong numbers, your phone could be _______.

A．deceptive
B．ineffective
C．deficient
D．defective
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单项选择题
Agriculture is the country's chief source of wealth, wheat _______ by far the biggest cereal crop.
A．is
B．being
C．been
D．be
单项选择题
Such euphemisms may be stylistically permissible if they are kept within _______.
A．boundaries
B．ranges
C．borders
D．limits
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