单项选择题

He expressed his gratitude to her for her favorable help with the experiment.

A．congratulations
B．sphere
C．thanks
D．sympathy
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单项选择题
It is easy for scientists to understand the significance of the doctor's findings.
A．complexity
B．simplicity
C．clearness
D．importance
单项选择题
For three months, the city was in turmoil due to serious unemployment.
A．disorder
B．influence
C．impact
D．inquiry
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