右图表示某一植物的一段枝条、枝芽、种子的结构示意图，据图回答： （1）图甲中的

Read and choose. (读短文，回答下列问题)

     Good morning, everyone. I'm Sarah. I'm from Canada. That is my family. My mother is beautiful.

She is drinking some tea. That's my father. He is very smart. He is drawing a duck. Who's that boy?

Oh, that is my brother, Joe. He is a student. He is singing and dancing now.

1. 一 Where is Sarah from?

    一 She is from _____.   

A. China    

B. America    

C. Canada

2. 一 How many people are there in Sarach's family?

    一 _____.          

A. Two      

B. Three        

C. Four

3. 一 Is Sarah's mother beautiful?

    一_____.        

A. Yes, she is        

B. No, she isn't

C. We don't know

4. Sarah's father is _____.        

A. drawing a duck        

B. drinking some tea

C. singing and dancing

5. Sarah's brother is a _____.   

A. teacher        

B. student    

C. girl

下列基因型中都是纯合子的一组是[ ]

A．RRDdFF与rrDdff

B．RrDDff与RrddFF

C．rrddFF与RRddff

D．RrDdFf与rrddff

下列物质中按混合物、氧化物、单质的顺序排列的是    【    】

A．冰水混合物水银食醋

B．清新的空气氖气水

C．可口可乐饮料过氧化氢红磷

D．酱油氯酸钾液氧

关于“人类行为分类”的描述，不正确的是（）

A.包括本能行为和社会行为

B.本能行为指人生来固有的行为

C.社会行为来自后天习得

D.人的社会行为与其所处的社会环境相适应

试述中 * * 党的领导在保障宪法实施中的作用。