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【单选题】
Which statement about convenience products is most likely 对?A.
They are distributed exclusively in only one or a few outlets per market area.
B.
They are products that consumers rarely consider buying.
C.
Luxury cars and designer clothes are examples of convenience products.
D.
Consumers need to make special purchasing efforts to buy such products.
E.
They are bought by consumers frequently and with minimal comparison.
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举一反三
【单选题】He is giving ______ some presents.
A.
I and Simon
B.
Simon and I
C.
Simon and me
D.
me and Simon
【单选题】Simon: Is there any chance of my borrowing your type-writer? Cindy: _______ Simon: Until the end of the week.
A.
For how long?
B.
How come?
C.
What’s the matter?
D.
Pardon?
【单选题】肺炎双球菌的转化实验证明了 DNA 是遗传物质 , 而蛋白质不是遗传物质 . 得出这一结论的关键是 ( )
A.
用 S 型活菌和加热杀死后的 S 型菌分别对小白鼠进行注射 , 并形成对照
B.
用杀死的 S 型菌与无毒的 R 型菌混合后注射到小鼠体内 , 测定小鼠体液中抗体的含量
C.
将 S 型菌的各种因子分离并分别加入各培养基中 , 培养 R 型菌 , 观察是否发生转化
D.
从死亡小鼠体内分离获得了 S 型菌
【简答题】简述左手定则的内容
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