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【单选题】
细胞株的特点是( )。A.
首次传代成功后的细胞群
B.
遗传物质发生改变
C.
由单细胞增殖形成具有特殊性状或标志的细胞群
D.
体外转化的细胞群
E.
核型为二倍体的细胞群
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举一反三
【单选题】I agree with _____ of what you said, but I don't agree with _____. [ ]
A.
most, nothing
B.
most, everything
C.
something, most
D.
everything, most
【单选题】Book three is ______ most difficult book,but is isn’t ______ most difficult one in Senior school books.
A.
a;a
B.
a;the
C.
the;the
D.
the;a
【单选题】In spite of the fact that soccer is the most popular international sport, it isn’t what most girls ________. [ ]
A.
go in for
B.
make up for
C.
do away with
D.
put up with
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