问题
单项选择题
在正常人血清中，含量最高的补体成分是
A．C1
B．C3
C．C4
D．C5
E．C9
答案
参考答案：B
解析：记忆型题，补体C3在血清中含量最高。
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在正常人血清中，含量最高的补体成分是
A．C1
B．C3
C．C4
D．C5
E．C9
参考答案：B
解析：记忆型题，补体C3在血清中含量最高。
Bill is a lovely boy. He is four years old. There is a park near 1___ house. It is small but beautiful. He 2 with other children in the park every day. One day, his mother buys new clothes for him. 3 clothes are nice and expensive. Bill is very happy. “Mum, may I go out 4 play with my friends? I want to show them my 5 clothes.” Asks Bill. “Yes, please keep your clothes clean.” Says his mother, “I'm going to do some cooking. We will have 6 after your father comes back.” At about six his father comes back 7 work. Bill goes home for dinner. “Why do you have so much dirt（泥土）on your 8 ? ” asks his mother when Bill comes into the room.. “Because I have some falls （跌倒）”, answers Bill. “You mustn't have some falls when you 9 the nice clothes,” says his mother. “I'm sorry, Mum,” 0 Bill. “But I have no time to take off my clothes when I fall.”
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