长期接触含游离二氧化硅（SiO2）的粉尘可引起的疾病是（） A.尘肺 B.煤肺 C.

根据证券法律制度的规定，下列各项中，属于收购人可以向中国证监会提出免于以要约方式增持股份的情形有（）

A．收购人与出让人能够证明本次转让未导致上市公司的实际控制人发生变化

B．上市公司面临严重财务困难，收购人提出的挽救公司的重组方案取得该公司股东大会批准，且收购人承诺1年内不转让其在该公司中所拥有的权益

C．上市公司面临严重财务困难，收购人提出的挽救公司的重组方案取得该公司股东大会批准，且收购人承诺2年内不转让其在该公司中所拥有的权益

D．经上市公司股东大会非关联股东批准，收购人（无控制权）取得上市公司向其发行的新股，导致其在该公司拥有权益的股份超过该公司已发行股份的30%，收购人承诺3年内不转让本次向其发行的新股，且公司股东大会同意收购人免于发出要约

关于能源利用说法中正确的是（　　）

A．煤、石油、太阳能都是不可再生资源

B．风能、太阳能是绿色能源应大力开发利用

C．核电站是利用原子核聚变所释放的能量来发电

D．火箭发射利用的燃料是液态氢，是因为它含有的热量多

国家应对经济中所有企业在一定时期内的( )进行加总。

A．增加值
B．利润额
C．附加值
D．波动值

Parents should stop blaming themselves because there's not a lot they can do about it. I mean the teenager problem. Whatever you do or however you choose to deal with it, at certain times a wonderful, reasonable and helpful child will turn into a terrible animal.

I've seen friends deal with it in all kinds of different ways. One strict mother insisted that her son, right from a child, should stand up whenever anyone entered the room, open doors and shake hands like a gentleman. I saw him last week when I called round. Sprawling himself on the sofa in full length, he made no attempt to turn off the loud TV he was watching as I walked in, and his greeting was no more than a quick glance at me. His mother was ashamed. "I don't know what to do with him these days," she said. "He's forgotten all the manners we taught him."

He hasn't forgotten them. He' s just decided that he' s not going to use them. She confessed that she would like to come up behind him and throw him down from the sofa onto the floor.

Another good friend of mine let her two daughters climb all over the furniture, reach across the table, stare at me and say, "I don't like your dress; it's ugly." One of the daughters has recently been driven out of school. The other has left home.

"Where did we go wrong?" her parents are now very sad. Probably nowhere much. At least, no more than the rest of that unfortunate race, parents.

小题1:This text is most probably written by _______.

A．a headmaster of a middle school

B．a specialist in teenager studies

C．a parent with teenage children

D．a doctor for mental health problems小题2:The boy on the sofa would most probably be described as _______.

A．lazy

B．quiet

C．unusual　　　　　

D．rude小题3:From the second example we can infer that the parents of the two daughters _______.

A．pay no attention to them

B．feel helpless to do much about them

C．are too busy to look after them

D．have come to hate them小题4:What is the author's opinion about the sudden change in teenage children?

A．Parents have no choice but to try to accept it.

B．Parents should pay still more attention to the change.

C．Parents should work more closely with school teachers.

D．Parents are at fault for the change in their children.

在并联的强酸性氢离子交换剂的氢-钠离子交换法中，为了确保软化水不呈酸性，一定要控制好氢、钠离子交换器的出水量的相互比例。