题目内容
（请给出正确答案）
[主观题]
The only safe way of distinguishing between edible and poisonous mushrooms is to learn to_
___the individual species.
A．identify
B．classify
C．isolate
D．separate
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白色恶露持续时间是
A．1周～2周
B．2周～3周
C．3周～4周
D．4周～5周
E．5周～6周
