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【多选题】
.有关DNA分子结构的叙述，正确的是A.
DNA分子由4种脱氧核苷酸组成
B.
DNA上相邻碱基以氢键连接
C.
碱基与相连接
D.
磷酸与脱核糖交替连接构成DNA 链的基本骨架
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举一反三
【简答题】阅读理解。 My name is Mary. I'm a student. I have two sisters. They are Sandra and Linda. I like eggs and ice cream. But Sandra doesn't like eggs or(或者) ice cream. Sandra likes salad and chicken. Lind...
【简答题】阅读理解。 My name is Carol. I'm seen and I'm from Australia. I have two sisters. Eileen is thir and Ruth is eleven. We are all students now. But I want to be a policeman in the future (将来), I thi...
【单选题】I have two sisters. are teachers.
A.
Both of them
B.
All of them
C.
Either of them
D.
Neither of them
【单选题】I have two sisters. One is a teacher, ____ is a doctor. [ ]
A.
other
B.
another
C.
others
D.
the other
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