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【简答题】
For this variety, they _________ the very genes
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举一反三
【简答题】基因工程技术是（）的核心技术。
【单选题】The old gentleman just stood there ________ at the pickpocket and did not say a word. [ ]
A.
glaring
B.
staring
C.
gazing
D.
glancing
【单选题】The old man stood there, _______ .
A.
with back against the wall
B.
with his back against the wall
C.
and back against wall
D.
his back was against the wall
【单选题】The old man stood there, ____.
A.
with back against the wall
B.
with his back against the wall
C.
and back against the wall
D.
his back was against the wall
【简答题】基因工程技术的核心—— 。
【简答题】设A、B、C、D、E为五个共线点，求证：(AB，CD).(AB，DE).(AB，EC)＝1．
【单选题】The old man stood there,__________.
A.
with back against the wall
B.
with his back against the wall
C.
with back against wall
D.
his back against wall
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