自然界中不存在的蛋白质的合成首先应设计[ ]
A．基因结构
B．mRNA结构
C．氨基酸序列
D．蛋白质结构
答案：D
用括号内所给单词的适当形式填空
1. All his ________ (class) finish at five in the afternoon.
2. We ________ (China) people are kind to others.
3. We all like ________ (play) computer games.
4. Miss Zhang is our English teacher. We all like ________ (she) very much.
5. The ________ (five) day of a week is Thursday.
近代地球科学证实，石油、天然气和煤，都形成并大多聚集于（）中。
A.岩浆岩
B.沉积岩
C.石灰岩
D.变质岩
