单项选择题

It is not easy to （） oneself of his bad habits, just as the proverb says, "Old habits die hard".

A．remove
B．kill
C．dismiss
D．rid

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单项选择题
Scientists have spent years into the effects of certain chemicals on the human brain, but with no result.（）

A．studying
B．researching
C．investigating
D．inspecting
单项选择题
The old worker has been on the （） in this factory for nearly 20 years.

A．pay packet
B．payoff
C．payroll
D．payment
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