食物中的营养素主要包括哪几种？

（）可用发电机电动势E和相位角δ表示。

A.发电机端电压

B.发电机定子电流

C.发电机转速

D.发电机功率

(选做题)回答下列有关生物技术实践的问题。

(1)某同学设计的提取玫瑰精油的实验流程如图所示：

在②步中使用___________(填“水中"“水上”或“水汽”)蒸馏更简便易行。在操作时向蒸馏烧瓶中加入几片碎瓷片，目的是_____________。

(2)提取精油时，为了使油水分层，要向油水混合物中加入_________，分离的油层还含有少量水，需加入__________，再用过滤法将其除去。

(3)提取玫瑰精油的另一种方法是___________。

(4)生产上为了扩大玫瑰花的种植，采用组织培养。如果组织培养中外植体选取的材料为茎段，插入培养基时应注意___________。培养一段时间后，会通过_________形成愈伤组织，愈伤组织细胞的特点是_________________。

(5)组织培养依据的原理是__________。选取合适的外植体作为起始材料，并要对外植体进行。植物组织培养的培养基成分与微生物的培养基主要区别在于需要加入，组织培养的过程中需要的环境条件有哪些______________(至少3点)。

消费者保护法的基本原则有（）

A.对消费者特别保护原则

B.国家与社会干预原则

C.自我约束原则

D.综合法律保护原则

阅读理解。

Dear editor,

     I read with interest the article on American families. In general I agree with it, but there are some important

things it left out. It didn't tell the reader much about the life of a househusband. It's not an easy life. I know,

because I'm now a househusband myself. A househusband has to change many of his ideas and his ways.

     First of all, he has to change the way he thinks about time. Before I was a househusband, I worked full-time

for the New York Times. I was a reporter, and time was always important. Everyone was always in a hurry.

     However, it's different at home. The househusband cannot be in a hurry all the time. If you rush around,

you will make everyone unhappy because they don't understand. For them, time is not important. So you have

to learn to slow down. That is the first and most important rule for a househusband.

     What's more, there is something else the househusband must learn. You must learn to show how you feel

about things. Many men do not know how to talk about their anger, worries, or love. But children need to know

how much you love them. If you are angry, they need to know why. So does your wife. If you do not say

anything, your family may get the wrong idea. Then there may be serious problems.

     People talk a lot about househusbands these days. Usually they talk about men doing the housework, the

cooking, cleaning, and shopping. But in my opinion, these are the easiest things to learn. It is much harder for

me to change the way I think and the way I act with my family. I think other men will also find this harder,

but, like me, will find it necessary if they want to have a happy family! 

                                                                                                                             Ted Diamond

                                                                                                                             Hartwell, New Jersey

1. The text is mainly about ____.

A. fathers and children

B. life as a househusband

C. ideas about time

D. American families

2. Family problems can occur if ____.

A. men get wrong ideas about something

B. men talk too much with their families

C. men don't talk enough with their families

D. people talk a lot about househusbands

3. Ted thinks ____.

A. learning about housework is easy

B. learning about housework is a problem

C. being a househusband is an easy task

D. cooking is the easiest thing to learn

4. How is the text developed?

A.  B.  C.  D.

(① = paragraph l; ② = paragraph 2; ③ = paragraph 3;

④ =paragraph 4; ⑤ = paragraph 5)

高血压患者的静脉复合麻醉，不能选用的药物（）

A.氟芬合剂

B.丙泊酚

C.氯胺酮

D.咪达唑仑

E.硫喷妥钠