不锈钢和铜焊接时，若采用不锈钢焊缝，如当焊缝含铜达到一定数量时，就会产生（）。A.变

阅读理解。

     As any homemaker who has tried to keep order at the dinner table knows, there is far more to a family meal

than food. Sociologist (社会学家) Michael Lewis has been studying 50 families to find out just how much

more. 

       Lewis and his co-workers carried out their study by videotaping (录像) the families while they ate ordinary

meals in their own homes. They found that parents with small families talk actively with each other and their

children. But as the number of children gets larger, conversation gives way to the parents' efforts to control the

loud noise they make. That can have an important effect on the children."In general the more question-asking

the parents do, the higher the children's IQ scores," Lewis says."And the more children there are, the less

question-asking there is."

     The study also provides an explanation for why middle children often seem to have a harder time in life than

their brothers and sisters. Lewis found that in families with three or four children, dinner conversation (交谈) is

likely to center on the oldest child, who has the most to talk about, and the youngest, who needs the most

attention."Middle children are invisible," says Lewis."When you see someone get up from the table and walk

around during dinner, chances are it's the middle child." There is, however, one thing that stops all conversation and prevents anyone from having attention:"When the TV is on," Lewis says,"dinner is a non-event."

1. The writer's purpose in writing the text is to ________.

A. show the relationship between parents and children

B. teach parents ways to keep order at the dinner table

C. report on the findings of a study

D. give information about family problems

2. Parents with large families ask fewer questions at dinner because ________.

A. they are busy serving food to their children

B. they are busy keeping order at the dinner table

C. they have to pay more attention to younger children

D. they are tired out having prepared food for the whole family

3. By saying "Middle children are invisible" in paragraph 3, Lewis means that middle children______.

A. have to help their parents to serve dinner

B. get the least attention from the family

C. are often kept away from the dinner table

D. find it hard to keep up with other children

4. Lewis' research provides an answer to the question _________.

A. why TV is important in family life

B. why parents should keep good order

C. why children in small families seem to be quieter

D. why middle children seem to have more difficulties in life

5.  Which of the following statements would the writer agree to?

A. It is important to have the right food for children.

B. It is a good idea to have the TV on during dinner.

C. Parents should talk to each of their children often.

D. Elder children should help the younger ones at dinner.

世上谁没有追求?谁没有向往?谁没有渴望得到的事物?也许有人渴望得到理解、爱护、肯定、温暖……也许有人渴望得到一本好书、一台电脑、一张邮票、一个足球……也许渴望得到……把它写出来吧。请以“渴望得到     ”为题写一篇550字左右的记叙文。

要求：

1．注意审题。

2．杜绝编造故事，请写身边的真人真事，表达自己的真情实感。

3．不要在文中出现自己的学校、班级、姓名等有关信息。

下列不属于我国小学德育基本内容的是（）。

A.爱国主义教育

B.理想教育

C.集体主义教育

D.生命教育

已知∠AOB=45°，∠BOC=30°，求∠AOC的度数。

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A．①②③

B．①②③④

C．①②④

D．①③④