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【单选题】
将小鼠骨髓瘤细胞与一种 B淋巴细胞融合,使融合细胞经产生单克隆抗体,其依据是A.
骨髓瘤细胞可以产生抗体，但不能无限增殖
B.
B淋巴细胞只有与骨髓瘤细胞融合才能产生抗体
C.
骨髓瘤细胞可以无限增殖，且能产生抗体
D.
B淋巴细胞可以产生抗体，但不能无限增殖，骨髓瘤细胞可以无限增殖
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【单选题】The phrase “lost your taste” (paragraph 1) most probably means ________.
A.
lost the sense of taste
B.
take no interest
C.
want to give up
D.
be disgusted with
【单选题】The phrase “lost your taste” (paragraph 1) most probably means ________.
A.
lost the sense of taste
B.
want to give up
C.
take no interest
D.
be disgusted with
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【单选题】—I _____ a set of keys. Do you see them? —Sorry, but you can go to the lost and found. [ ]
A.
lost
B.
found
C.
have
【单选题】In the third paragraph, the phrase 'go down the drain' probably means _______.
A.
lost in a wasteful way
B.
draw off gradually
C.
drink all the liquid from the cup
D.
receive the waters of a lake
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