单项选择题
早期在肺炎球菌中进行的转化实验表明:
A.细菌的遗传特性通过与不同特性细菌的DNA接触后会发生永久性的变化。
B.细菌的非遗传特性通过特性不同的细菌的DNA接触后发生永久性的变化。
C.所有遗传物质必须都含有DNA。
D.细菌中的所有基因必然携带在DNA分子上。
A.细菌的遗传特性通过与不同特性细菌的DNA接触后会发生永久性的变化。
B.细菌的非遗传特性通过特性不同的细菌的DNA接触后发生永久性的变化。
C.所有遗传物质必须都含有DNA。
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单项选择题
听音频:{MP3: imgcache attached media 20140429 20140429164127_0513.mp3} 根据听到的内容,回答下列各题。 A.Because he was setting up a new mail box.B.Because he parked his car under the 'No Parking' sign.C.Because he was stuck in his neighbors party.D.Because he couldnt get his car out of the garage.
A.mp3}
B.Because
C.
B.Because
D.
C.Because
E.
D.Because
F.
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单项选择题
A.Its not time to buy a car.B.Each dealer has his advantage.C.People cant have all the good things.D.Its hard to make decision.
A.Its
B.
B.Each
C.
C.People
D.
D.Its
E.
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