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问题 单项选择题

细胞间相互作用不受MHC限制的是

A．Tc细胞与肿瘤细胞

B．NK细胞与肿瘤细胞

C．树突状细胞与Th细胞

D．Th细胞与B细胞

E．巨噬细胞与Th细胞

答案

参考答案：B

解析：NK细胞为非特异性免疫细胞，其杀伤作用不受MHC分子限制。

单项选择题

The trustees of the Avonbridge summer drama workshop have decided to offer scholarships to the top 10 percent of local applicants and the top 10 percent of nonlocal applicants as judged on the basis of a qualifying audition. They are doing this to ensure that only the applicants with the most highly evaluated auditions are offered scholarships to the program.
Which one of the following points out why the trustees’ plan might not be effective in" achieving its goal ？（）

A．The best actors can also apply for admission to another program and then not enroll in the Avonbridge program.

B．Audition materials that produce good results for one actor may disadvantage another, resulting in inaccurate assessment.

C．The top 10 percent of local and nonlocal applicants might not need scholarships to the Avonbridge program.

D．Some of the applicants who are offered scholarships should have less highly evaluated auditions than some of the applicants who are not offered scholarships.

E．Dividing applicants into local and nonlocal groups is unfair because it favors nonsocial applicants.
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单项选择题

肺炎合并心衰每日的补液量为()

A．严格限制，越少越好

B．60～80ml/kg

C．>80ml/kg

D．90～120ml/kg

E．120～150ml/kg
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