问题
单项选择题
NK细胞杀伤肿瘤细胞是通过（）。
A.特异性地识别肿瘤细胞表面的MHCⅠ类分子
B.将肿瘤细胞内化杀伤
C.释放穿孔素
D.释放TNF-β
E.释放IFN-α
答案
参考答案：C
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NK细胞杀伤肿瘤细胞是通过（）。
A.特异性地识别肿瘤细胞表面的MHCⅠ类分子
B.将肿瘤细胞内化杀伤
C.释放穿孔素
D.释放TNF-β
E.释放IFN-α
参考答案：C
Do you know what are good manners (礼貌)？In fact , having good manners is 46 in different countries . In some Asian countries , it is good manners to take off your 47 before you go into a house . 48 in European countries , even if they sometimes are very dirty, this is not done. If you are a guest (客人)in a Chinese house , when you have a meal , you usually do not 49 food . You often leave a little to show that you have had 50 . But in England , a guest always finishes food to show that he 51 it . We must know the customs (风俗) of other countries , so that they will not think 52 bad--mannered . People all over the world 53 that a well—mannered person should be kind and 54 to others. If you remember this , at least you will not go far wrong . Everybody likes a person 55 good manners , and no one likes a person with bad manners. Keep your manners, please .
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