单项选择题

A．He has learned a lot from his own mistakes.
B．He is quite experienced in taming wild dogs.
C．He finds reward more effective than punishment.
D．He thinks it important to master basic training skills.
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单项选择题
The Japanese staff complained to the American manager because ______.
A．the American manager had lied to them
B．the salary increases were insufficient
C．most staff had not received salary increases
D．there was a misunderstanding of the word "fair"
单项选择题
The National Academy of Sciences holds the stance that ______.
A．DNA testing should be systematized
B．only authorized laboratories can conduct DNA testing
C．the academy only is authorized to work out standards for testing
D．the academy has the right to accredit laboratories for DNA testing
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