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【单选题】
下列叙述正确的是（ ）A.
将Fe（OH） 3 粉末溶于水中可得Fe（OH） 3 胶体
B.
电泳现象可证明胶体属于电解质溶液
C.
利用丁达尔效应可以区别溶液与胶体
D.
胶体粒子很小，可以透过半透膜
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【简答题】Want to save the environment? You probably can’t fix everything on your own, but by taking small steps and keeping the environment in mind every day, you can make a difference, 1. Think Green. Challen...
【单选题】The word 'amygdala'(Line 2, Para.4) probably refers to the area in the brain that
A.
memorizes fearful situations
B.
reacts to fearful situations
C.
control negative emotions
D.
reflects unforgettable images
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【简答题】in order to know a foreign language thoroughly(完全地), four things are necessary. Firstly, we must understand the language when we hear it spoken. secondly, we must be able to speak it ourselves, with c...
【单选题】下列说法中不正确的是( )。
A.
乙二醇中由于含有二个亲水性基团，因此它可以任意比例与水混合
B.
由于胺基为亲水性基团，因此均苯三胺可以任意比例与水混合
C.
由于异丙醇中含有1个羟基，因此异丙醇可以与水混合
D.
由于正丁醇中含有1个羟基，因此正丁醇可以任意比例与水混合
【单选题】What does the author say about reciting a memorized text?
A.
It is only customary to memorize the shortest speeches.
B.
It should be encouraged to do so though it is not customary today.
C.
Speakers should try to remember all the words all the time.
D.
It is always better than reading through the manuscript.
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