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

单项选择题

Little Hercules is the first remotely controlled vehicle ______.

A. that can be used for deep-sea expedition
B. that is used to explore the "Coral Triangle"
C. that can go as deeply as 2.3 miles undersea
D. that is developed by American scientists

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