单项选择题

We all __________ our tone when speaking to people in authority.

A．notify
B．glorify
C．clarify
D．modify
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单项选择题
The strike is going on as both the management and workers are__________.
A．incompatible
B．indispensable
C．inflexible
D．indefensible
单项选择题
It's said that plants __________ with a virus give off a gas that stimulates disease resistance in neighboring plants.
A．interacted
B．inflicted
C．infected
D．induced
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