单项选择题

The IgE antibodies are produced when ______.

A. the skin is pierced
B. the suspect food is injected
C. there is an allergic reaction
D. there is a diagnosis
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单项选择题
The discovery of the two chirostylid crabs is mentioned as an example to illustrate ______.
A. the uniqueness of the fauna
B. the diversity of the corals
C. the relation between the corals and the fauna
D. the similarity between the corals and a rainforest
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dealing with
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