题干

人体对病原体具有一定的防御功能,下列叙述正确的是(     )

A:免疫应答包括对抗病原体感染的非特异性防卫和特异性反应

B:成熟的T淋巴细胞通过识别抗原-MHC复合体来参与免疫应答

C:淋巴细胞从功能上分为T淋巴细胞、B淋巴细胞和巨噬细胞

D:巨噬细胞在人体对抗病原体的三道防线中都起着重要的作用

上一题 下一题 0.0难度 选择题 更新时间:2019-09-12 07:03:09

答案(点此获取答案解析)

B

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阅读下列短文,从每题所给的A、B、C和D四个选项中,选出最佳选项,并在答题卡上将该项涂黑。

    Have you ever fancied sailing around the world or buying a holiday home in the Caribbean? Well, before you get too excited, it may help to find out if you have what it takes to become a billionaire.   

    We've all heard stories of school drop-outs who have made their fortune. Do they tend to be university graduates or self-made successful people? Are they married or single?

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    Another interesting trend is that the world's richest people are much more likely to be married - only 12% of billionaires are unmarried. Finally, the percentage of billionaires who are bald is quite high – so don't worry if you're losing your hair.