单项选择题

What is mentioned as a disadvantage of food challenge

A. People are unaware of what they are eating.
B. People may be given frightening food to eat.
C. The food may cause life-threatening allergy.
D. It takes much time to get the food prepared.

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单项选择题

According to Dr. Shank, the Wallace Line ______.

A. hasn’t been hilly accounted for
B. doesn’t really exist
C. can justify the marine diversity
D. is derived from undersea

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