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简述内部分工与外部分工的不同。

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具有过敏毒素作用的补体成分为

A. Cl
B. C3a
C8
D. C9
E. C2a

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简述调拨价格的含义。

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下列哪些CD分子与B细胞识别、黏附、活化无关

A. CD19
B. CD21
CD40L
D. CD40
E. CD80

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Questions 16 to 18 are based on the passage you have just heard.

A. Helping control pain of patients.
B. Contributing to being calm and happy.
C. Enhancing interpersonal relationship.
D. Increasing young children"s mental ability.

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