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 committee report of National Academy of Sciences in Washington reveals that ________.
A．ice from Antarctica and Greenland is appropriate to show the change
B．carbon dioxide is released mainly from the fuel
C．level of carbon dioxide increases with global temperatures
D．carbon dioxide is helpful for tree growth
填空题
A．seekingB．stimulatingC．shapingD．securing
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