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【单选题】
下列关于DNA双螺旋结构模型的叙述中,除了哪一项外其余都是正确的。A.
两股核苷酸链呈反向平行。
B.
两股链间有严格的碱基配对关系。
C.
为右手螺旋,每个含十对碱基。
D.
极性磷酸二酯键位于双螺旋内侧。
E.
螺旋直径约为两纳米。
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反馈参考答案：
举一反三
【单选题】Betty is never , but she has to look after her sister every day.
A.
ill; sick
B.
sick; ill
C.
ill; ill
【简答题】She is to look after the child.
【单选题】I can ______ her sudden friendliness she wants me to look after her parrot while she is away.
A.
work out
B.
make out
C.
see through
D.
figure out
【简答题】What do we learn about the woman? A. She is a designer. B. She gets a high salary. C. She often works at night time. D. She has to look after her daughter during the day
【简答题】He told me that I＿＿＿be present at the meeting．
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