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问题 单项选择题 B型题

识别B细胞的表面标志是（）.

A.Smlg

B.CD3

C.C3b受体

D.C3d受体

E.CD4

答案

参考答案：A

填空题

[理]已知空间向量a=（λ，1，-2），b=（λ，1，1），则λ=1是a⊥b的______条件．

[文]设p：x＞1，q：x≥1，则p是q的______条件．（选填“充分不必要”、“必要不充分”、“充要”、“既不充分也不必要”）
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补全对话，情景问答
从方框中选择适当的选项补全对话。
A. Thank you, doctor.
B. I am not feeling very well.
C. Good afternoon.
D. Is it serious?
E. Do you have a headache?
A: Good afternoon, Dr. Smith.
B: 1______ Sit down, please. What's wrong with you?
A: I don't know. But 2______.
B: You look pale. 3______
A: Yes.
B: Er … Let me check you over first … Oh, you have the flu.
A: 4______
B: Don't worry. Nothing serious. Take this medicine three times a day.
A: 5______
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