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【单选题】
以下哪一个模式是表示一个作用于某对象结构中的各元素的操作，它使我们可以在不改变各元素的类的前提下定义作用于这些元素的新操作（）A.
访问者模式
B.
桥接模式
C.
原型模式
D.
单例模式
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举一反三
【单选题】There are_____ people in the supermarket .I t is so crowded.
A.
hundreds
B.
hundreds of
C.
hundred of
D.
hundred
【单选题】The unity of the genetic code indicates( )
A.
The genetic code of all organisms is the same
B.
The nuclear genetic code of all organisms is the same
C.
The evolutionary process, the genetic code does not change
D.
All genetic information is regulated by the same factor
【单选题】Where is the supermarket?
A.
It's next to the bookstore.
B.
You can buy fruits here.
C.
The supermarket is very large.
D.
I don't like seafood.
【简答题】I was shopping in the supermarket when I heard a young voice boom from across the aisle. “Mom, come here! There’s this lady here my size!” The mother rushed to a boy she called Mickey; then she turned...
【简答题】基因工程抗体(genetic engineering antibody)
【单选题】The supermarket is crowded. I _______. [ ]
A.
catch my mother's hand
B.
reach my mother by hand
C.
take my mother by the hand
D.
hold my mother in hand
【单选题】There are_____ people in the supermarket .I t is so crowded.
A.
hundred
B.
hundreds
C.
hundreds of
D.
hundred of
【简答题】什么是 基因工程制药( genetic engineering pharmaceutics ) 。
【简答题】遗传密码(genetic codon)
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