单项选择题

The use of the chemical may present a certain hazard to the laboratory workers.()

A. protection
B. indication
C. immunity
D. danger

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单项选择题
Do you believe these two intimate friends used to be enemies()

A. bearable
B. internal
C. close
D. believable
单项选择题
He has trouble understanding that other people judge him by his social skills and conduct().

A.style
B.behavior
C.mode
D.attitude
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