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【单选题】
下面关于Watson-Crick DNA双螺旋结构模型的叙述中哪一项是正确的?A.
3' ， 5' －磷酸二酯键
B.
互补碱基对之间的氢键
C.
碱基堆积力
D.
磷酸基团上的负电荷与介质中的阳离子之间形成的离子键
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反馈参考答案：
举一反三
【单选题】I ____ the gift to him as soon as I see him.
A.
give
B.
will give
C.
have given
D.
gave
【单选题】I him all about it as soon as I see him next month.
A.
tell
B.
is telling
C.
told
D.
will tell
【单选题】I never answer his calls and I ignore him every time I see him, hoping that he'd get the _____. [ ]
A.
information
B.
news
C.
message
D.
word
【单选题】I won’t give it to him until I see him .
A.
in person
B.
in personal
C.
personal
D.
in personally
【单选题】I will tell him ___________ I see him.
A.
after soon
B.
soon as
C.
as soon as
D.
till
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