单项选择题

An international treaty signed several years ago bans trade in plants and animal of endangered species.

A．forbids
B．eliminates
C．promotes
D．protects
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单项选择题
A good employer gives hints to his or her employees without interfering with their creativity.
A．freedom
B．assistance
C．clues
D．funds
单项选择题
It is not easy to remain tranquil when events suddenly change you life.
A．calm
B．upset
C．steady
D．severe
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