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
Lighting levels are carefully controlled to fall within an acceptable level for optimal reading convenience.
A．ideal
B．required
C．optional
D．standard
单项选择题
Factors leading to the crisis included poor regulation, mismanagement and deception in the industry, and competition from other types of financial firms.
A．cheating
B．pollution
C．depression
D．abuse
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