单项选择题

The fire dance is the climax of the ceremony of the Navajo night chants.

A．addition to
B．high point in
C．substitute for
D．beginning of
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单项选择题
Angiogenesis factor is a substance that can promote rapid healing of wounds.
A． Right
B． Wrong
C． Not mentioned
单项选择题
Research into angiogenesis takes a long time to go from the first trials to genera use.
A． Right
B． Wrong
C． Not mentioned
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