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【简答题】
B 型 DNA 双螺旋的螺距为 ___ ,每圈螺旋有 ___ 对碱基。
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举一反三
【单选题】As children we were best friends, but as we grew up we just drifted _____.
A.
apart
B.
away
C.
off
D.
out
【单选题】店铺推广的关键词最低起价多少? (6 分)
A.
店铺推广的关键词最低起价是0.1元。加价幅度至少为0.01元
B.
店铺推广的关键词最低起价是0.1元。加价幅度至少为0.1元
C.
店铺推广的关键词最低起价是0.2元。加价幅度至少为0.01元
D.
店铺推广的关键词最低起价是0.2元。加价幅度至少为0. 1元
【单选题】As we age , the language center in our brain becomes less flexible than it was when we were small children, and learning an additional language with fluency will always take vastly longer than it ...
A.
Grow old.
B.
Length of time that a person has lived or a thing has existed.
C.
Old age.
D.
Latter part of life.
【单选题】The warning we were given as children ________ an apple a day keeps the doctor away may，in fact，have a scientific explanation.
A.
that
B.
who
C.
where
D.
which
【单选题】As we grow older, birthdays seem to more quickly than when we were children.
A.
come in
B.
come around
C.
come out
D.
come over
【单选题】The warning we were given as children ________ eating fast will make you fat, may in fact, have a scientific explanation.
A.
that
B.
who
C.
where
D.
which
【简答题】As children we were very close, but as we grew up we just __________.
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