单项选择题

There is no denial that in the tropical area there is a high（）of malari

A. incident
B. incidence
C. accident
D. precedent

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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
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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