生物体的遗传物质和生命活动的主要承担者分别是 ①核酸 ②核糖

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问题选择题

生物体的遗传物质和生命活动的主要承担者分别是

①核酸 ②核糖核酸 ③脱氧核糖核酸 ④蛋白质 ⑤脂类 ⑥糖类[ ]

A．①④

B．②⑤

C．③⑥

D．②④

答案

答案：A

阅读理解

阅读短文，判断下面的句子是对还是错，对的打“√”，错的打“×”。

Chen Jie is my best friend. She is quiet and thin. She has long hair. Her eyes are big and black. Her nose is

small. She likes painting very much. She is a good student. The teachers like her.

( ) 1. Chen Jie is a strong girl.

( ) 2. Her hair is long.

( ) 3. She has big and blue eyes.

( ) 4. She likes music.

( ) 5. The teachers like Chen Jie.

问答题

试述颈外动脉的分支。