单项选择题

On September 2, 1937, President Roosevelt signed legislation that was to have far-reaching consequences for American wildlife.

A．effect
B．disaster
C．challenge
D．magic
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单项选择题
The boss felt suspicious about the truth of the account, therefore, he determined to get down to having a good check.
A．mistrustful
B．furious
C．considerate
D．depressed
单项选择题
Overcoming setbacks takes time, efforts and perseverance.
A．maintenance
B．assistance
C．persistence
D．determination
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