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【单选题】
某实验室做了如下图所示的实验研究,下列与实验相关的叙述正确的是( )A.
过程①导入的诱导基因使成纤维母细胞发生基因突变
B.
过程②属于动物细胞培养过程中的原代培养
C.
丙细胞既能持续分裂，又能分泌单一的抗体
D.
过程③④所用的培养基中都含有聚乙二醇
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反馈参考答案：
举一反三
【单选题】What does the word precursor in the context in the second paragraph mean? 查看材料
A.
A man that may come before the happening of an earthquake.
B.
The leading factor that may cause a series of events to occur.
C.
Any meaningful sigh that indicates some would-be happenings.
D.
An event that may have symbolic or significant nature.
【单选题】I don't know ____. Can you help me? [ ]
A.
what does the word mean
B.
what the word mean
C.
what the word means
D.
how the word means
【单选题】What does the author think of those single people?
A.
They are using excuses to cheat themselves.
B.
They should be sorry for being single.
C.
They don't like weddings, because they are expensive.
D.
They reject staying in a comfortable home with a beautiful bride.
【简答题】What does “hit single” mean?
【简答题】what does “single up forward to breast line and spring” mean?
【简答题】What does the word 'computers' originally mean according to the passage?
【单选题】What does the word 'defensive' mean in the passage? 查看材料
A.
易怒的
B.
攻击性的
C.
外向的
D.
有戒心的
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