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【单选题】
关于外毒素叙述正确的是:( )A.
主要由革兰氏阴性菌产生
B.
抗原性很弱
C.
经甲醛处理后可变成类毒素
D.
十分耐热
E.
蛋白质多糖的复合物
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知识点：
皮皮学刷刷变学霸
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【简答题】请上传第二遍课文朗读语音。
【简答题】请上传第五遍课文朗读语音。
【简答题】在一局单打比赛中，发球员的分数为0或双数时，双方运动员均应在各自的（）发球区发球或接发球。
【简答题】It was raining 1 . I couldn’t see 2 . I drove 3 . Suddenly, I saw a young girl. She was dressed 4 and standing in the middle of the road. I was surprised! Somehow, I stopped the car 5 . “ What are you...
【简答题】请上传第四遍课文朗读语音。
【单选题】.Clerk: Do you know the flight number?Guest: ________________.
A.
Yes, he is Tom
B.
Yes, it’s CA900.
C.
The flight is a direct flight.
D.
Here you are.
【单选题】Customer: Excuse me.______. Clerk: The rate for airmails is two dollars.
A.
Do you do international delivery?
B.
Can you tell me the money I need to post a letter?
C.
How much is a letter to South Mrica?
D.
Do you happen to know how fast airmails are?
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