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【单选题】
关于转位因子的描述错误是( )A.
转位因子包括插入序列和复合转座子
B.
不依赖于同源性重组可自行移动的遗传物质
C.
仅存在于细菌上
D.
携带耐药性基因的转座子是多重耐药菌形成和散播的重要原因之一
E.
伴随转座子移动会出现插入突变
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【简答题】As to the greenhouse effect，the author_____
【单选题】Greenhouse Effect A greenhouse is a building made of glass which is used for keeping plants warm when the outside temperature is low. In a similar way, there are several gases in the atmosphere which ...
A.
keep the plants warm.
B.
prevent air pollution.
C.
stop the greenhouse effect.
D.
produce useful gases.
【简答题】If there were no greenhouse effect， ．
【简答题】情景： John去找Smith，请他参加年度英语晚会，正巧他不在。 任务： 请你以John的名义用英语给Smith写一张50词左右的便条。 内容包括： ·你何时来的； ·邀请他去参加年度英语晚会，正巧他不在； ·年度英语晚会的时间和地点； ·晚会都有哪些节目； ·请他尽快跟你联系。 要求：格式准确，表达清楚，字迹工整。 参考词汇：年度英语晚会(the annual English evening)...
【单选题】According to the passage, which of the following is NOT TRUE about the greenhouse effect_______.
A.
Most of the greenhouse effect is caused by watr vapor in the atmosphere.
B.
Human beings hve little to do with the amount of water vapor in the atmosphere, thus playing no role in the greenhouse effect.
C.
Nitrous oxide also belongs to greenhouse gases which cause greenhouse effect.
D.
Without our atmosphere, there would be no greenhouse effect.
【简答题】The most abundant greenhouse gases are ______and______.
【简答题】The increase of greenhouse gases______________
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