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【单选题】
If the concentration of the reactant drops linearly as a function of time, the reaction is a _______ order reaction.A.
zeroth
B.
first
C.
second
D.
cannot decide
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反馈参考答案：
举一反三
【单选题】Teacher: Richard, class begins at 9, and you are late. Student: I know, but I missed my bus. I'm sorry. Teacher: ______. You have to be here on time.
A.
Don't mention it
B.
That's no excuse
C.
You needn't be
D.
No problem
【简答题】I (know) my teacher for a year and a half.
【单选题】条件致病菌致病的条件是（）
A.
正常菌群的耐药性改变
B.
正常菌群的遗传性状改变
C.
肠蠕动减慢使细菌增多
D.
长期使用广谱抗生素
E.
各种原因造成的免疫功能亢进
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