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【单选题】
原子是由居于中心的( )和核外带负电的电子构成的，原子本身呈中性.A.
带负电的原子核
B.
带正电的原子核
C.
带正电的质子
D.
不带电的中子
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举一反三
【单选题】写便 条:因你家人突然生病,周末你不能和 John 去跳舞了,你找了舞跳得很好的 Lisa 来代替你,并表示抱歉。 1)My mother is suddenly taken ill. 2)She is a better dancer, I think.My regrets. 3)In order not to disappoint you, I have asked Lisa to take m...
A.
1)-4)-3)-2)
B.
4)-1)-3)-2)
C.
1)-3)-2)-4)
D.
4)-3)-2)-1)
【简答题】用所给词的适当形式填空。 1. Today is my birthday. My mother is going to make a_______ (specially) meal for me. 2. Mary is interested in_______(dance). 3. My brother ________(play) the violin since two years ago. ...
【简答题】Can your mother _____ ( dance) ?2. Let's _____ (play) volleyball after school.3. What does your a1. Can your mother _____ ( dance) ? 2. Let's _____ (play) volleyball after school. 3. What does your au...
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