单项选择题

Her specialty is heart surgery.

A．region
B．site
C．field
D．platform
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单项选择题
It is logical that a detailed learning of plants and their properties must be extremely ancient.
A． Right
B． Wrong
C． Not mentioned
单项选择题
According to the passage, the new biology could potentially solve the pollution problem of automobiles by
A．using metal-hungry microbes.
B．making use of enzymes.
C．adjusting the engines.
D．patenting new lifeforms.
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