单项选择题

The writer suggests that today' s razor blades are made of ______.

A．steel
B．brass
C．iron
D．plastic
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单项选择题
On hearing the fire alarm, those in class should go to ______.
A．A Block
B．B Block
C．C Block
D．the Assembly Area
单项选择题
Which is the best title for this passage
A．Typical Problems Associated with Stress.
B．Higher Stress Levels among Top Managers.
C．Coping with Stress through a Positive Attitude.
D．Causes of Increased Stress in the Work Environment.
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