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【单选题】
Bt毒蛋白以伴孢晶体的形式存在细菌体内，晶体的形成在一定程度上防止了杀虫蛋白在环境中降解。完整的晶体只有经过蛋白酶分解成更小的分子－一个60kD左右的具胰蛋白酶抗性中心的小肽，才是真正具有致病力的物质，完整的晶体在下列哪种条件下可以分解。A.
酸性
B.
碱性
C.
中性
D.
弱酸性
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反馈参考答案：
举一反三
【简答题】I have read the material several times but it doesn't make any ________ to me. A meaning B. importance C. sense D. significance
【单选题】What is a proper "Read and Retell" material?
A.
Legal documents
B.
Government reports
C.
Social news
【简答题】从环境因素的可控程序看，可把决策分为______决策、______决策和______决策。
【单选题】I have read the material several times but it doesn't make any ______ to me.
A.
meaning
B.
importance
C.
sense
D.
significance
【单选题】Students of math must read the written material in the text before class because______.
A.
their instructors will explain it in class
B.
it contains much valuable information
C.
it will be examined
D.
it was written by some famous mathematicians
【单选题】In the author's opinion______.
A.
advertising can seldom bring material benefit to man by providing information
B.
advertising informs people of new ideas rather than wins them over
C.
there is nothing wrong with advertising in persuading the buyer
D.
the buyer is not interested in getting information from an advertisement
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