五角星的五个顶角都是锐角。[]

阅读理解。

     If you are in America or go to American families to have meals, you should learn some table manners.

Here are some tips:

     Don't circle your plate with your arms. If you do so, you will become the focus (焦点) of the table.

Everyone would wonder, "Is there anything wrong with the food?" This may give a wrong message that

you don't like the food or something like that.

     Don't push the plate back when finished, leave it where it was. Do you want to let the hostess know

that you've just done a labor?

     Don't lean (倚靠) back and say "I'm through" or "I'm full". Just put the fork and knife across the plate.

That's all.

     Don't cut up everything before you start to eat. Cut only one or two bites (块) at a time.

     Never take a huge mouthful of anything. Do you want to show how hungry you are? Don't do that.

It's not so good.

      It's never good to reach across the table for anything. If the thing you want is not at hand, simply ask

the nearest person for help, like "Mrs Smith, could you pass me the dish?"

1. According to the passage, which of the following is WRONG?

A. Leave the plate where it was when finished.

B. Cut up one or two bites before you start to eat.

C. Push the plate back where it was.

D. Don't take a huge mouthful of anything.

2. After finishing dinner, you should _____.

A. put the fork and knife across the plate

B. stand up and leave the table

C. say "I'm full"

D. say "Thank you"

3. If you want a dish far from you at table, you should _____.

A. ask the nearest person for help

B. leave your seat to get it

C. sit there until others help you

D. stand up and reach across the table for it

4. If you are at table and circle your plate with your arms, other people will think _____.

A. you don ' t like the food

B. the food isn ' t good for you

C. there is something wrong with the food

D. all above

5. Which can be the best title for this passage?

A. How to Behave in America?

B. Table Manners in America

C. What you Can Do in America?

D. Table Manners

______复审应该把重点放在系统的总体结构、模块划分、内外接口等方面。 ( )

A．详细设计

B．系统设计

C．正式

D．非正式

铁是生产生活中应用最广泛的一种金属．

（1）在酱油中加入铁强化剂，是我国为解决　    （填“甲状腺肿大”，“贫血”或“骨质疏松”）而实施的项目

（2）铁元素与地壳中含量最多的元素组成化合物的化学式为　     　（写出一种即可）．高铁酸钠（Na₂FeO₄）是一种新型高效的净水剂，高铁酸钠中铁元素的化合价为　　．

（3）常见的食品脱氧剂多为无机铁系脱氧剂，其主要成分为活性炭粉．请将下列脱氧中的主要反应的化学方程式补充完整：4Fe（OH）₂+O₂+2　 　═4Fe（OH）₃，此反应的基本类型是　             　．

启动旁路系统，一般分为Ⅰ、Ⅱ级旁路系统。其中Ⅰ级旁路是由过热器出口接至（）入口；Ⅱ级旁路是由再热器出口接至（）入口。