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【单选题】
黏土粒子由于断键引起的荷电，与溶液介质的pH值有关。高岭石在碱性介质中，（ ）。A.
A ．带正电荷
B.
不带电
C.
带负电荷
D.
不能确定
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举一反三
【单选题】—What’s your speech , Dr．Smith ? —Tomorrow you will get it．
A.
by
B.
of
C.
from
D.
on
【简答题】某商店出售的电灯泡由甲乙两厂生产,其中甲厂的产品占 60% ,乙厂的产品占 40%. 已知甲厂产品的次品率为 4% ,已厂产品的次品率 5%. 一位顾客随机地取出一个灯泡, (1) 这个灯泡是合格品的概率为__________ . (2) 如果发现这只灯泡是次品,其来源于甲厂的概率为_________ .
【单选题】What is the pirpose of Dr Kanazawa's study?
A.
To rate the attractiveness of the women.
B.
To track the lives of the women's children.
C.
To find out the gender of the women's children.
D.
To analyze data from a survey of the women's lives.
【单选题】What’s special about streets named after Dr. King in the U.S. and Puerto Rico?
A.
People named the streets after Dr. King only in memory of his assassination.
B.
The streets stand for all the achievements that Dr. King had made in his life.
C.
Dr. King’s dreams and what has yet to be achieved symbolized in the streets bearing his name.
D.
Civil rights activists have urged cities to name streets after the great leader.
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