问题
单项选择题
季铵化合物控制菌斑的主要作用是（）。
A．干扰菌斑附着
B．破坏菌斑基质
C．清除菌斑内毒素
D．改变细菌膜的通透性
E．控制菌斑繁殖
答案
参考答案：D
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季铵化合物控制菌斑的主要作用是（）。
A．干扰菌斑附着
B．破坏菌斑基质
C．清除菌斑内毒素
D．改变细菌膜的通透性
E．控制菌斑繁殖
参考答案：D
| 选词填空。 | |
请用下列方框中词组的适当形式完成句子.
1.He tried so hard to stay awake, but ______________he fell asleep. 2.If we plant trees every spring, in a few years' time the mountain ____________________trees. 3.I found your pen _____________ when I was cleaning the room. 4.In business, success not only__________________ what you say but also how you say it. 5.I am surprised that a quarrel _______________ between the two neighbours because they used to be close friends. 6.The police are still _____________ the lost boy though it is midnight. 7.The village among the mountains was ___________because of the heavy rain. 8.----I suppose your student doesn't understand you. ----____________, he understands me very much. 9.It's getting dark;___________, it is beginning to rain. 10.______________, I'd like to thank you for all you've done for me. |