单项选择题

My car is always breaking down, but I don't know enough about __________ to be able to fix it my self.

A．mechanics
B．mechanism
C．mechanic
D．medicine
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单项选择题
A new system of quality control was __________ to overcome the defects in the firm's products.
A．invested
B．installed
C．introduced
D．instructed
单项选择题
He tried to cope with the ever-increasing burden of his work, but finally __________ and had to take a complete rest.
A．broke away
B．broke down
C．broke off
D．broke through
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