问题 选择题

往AgNO3和Cu(NO3)2的混合溶液中加入一定量的铁粉,充分反应后过滤,向滤渣中加入稀盐酸,无气泡产生。根据上述现象,能得出的结论是

A.滤渣中一定有Fe粉

B.滤渣中一定有Cu粉

C.滤液中一定有Fe(NO3)2

D.滤液中一定有AgNO3、Cu(NO3)2

答案

 

题目分析:根据金属活动性顺序铁能与硝酸银、硝酸铜反应,但先于硝酸银反应,然后与硝酸铜反应,往AgNO3和Cu(NO3)2的混合溶液中加入一定量的铁粉,充分反应后过滤,向滤渣中加入稀盐酸,无气泡产生,说明金属铁没有剩余,故A选项是错误的叙述;B选项是错误的叙述,如果加入的铁较少,只能与硝酸银反应,故应该为可能有铜;C选项是正确的叙述,无论铁加入多少参加反应进入溶液;D选项是错误的叙述,根据加入量的多少,滤液中可能有AgNO3、Cu(NO3)2

单项选择题 B型题
阅读理解

Among various programmes, TV talk shows have covered every inch of space on daytime television. And anyone who watches them regularly knows that each one is different in style(风格). But no two shows are more opposite in content, while at the same time standing out above the rest, than the Jerry Springer and the Oprah Winfrey shows.

Jerry Springer could easily be considered the king of “rubbish talk”. The contents on his show are as surprising as can be. For example, the show takes the ever-common talk show titles of love, sex, cheating, and hate, to a different level. Clearly, the Jerry Springer show is about the dark side of society, yet people are willing to eat up the troubles of other people’s lives.

Like Jerry Springer, Oprah Winfrey takes TV talk show to its top. But Oprah goes in the opposite direction. The show is mainly about the improvement of society and different quality(质量) of life. Contents are from teaching your children lessons, managing your work week, to getting to know your neighbors.

Compared to Oprah, the Jerry Springer show looks like poisonous waste being poured into society. Jerry ends every show with a “final word”. He makes a small speech about the entire idea of the show. Hopefully, this is the part where most people will learn something very valuable.

Clean as it is, the Oprah show is not for everyone. The show’s main viewers are middleclass Americans. Most of these people have the time, money, and ability to deal with life’s tough problems. Jerry Springer, on the other hand, has more of a connection with the young adults of society. These are 18-to-21-year-olds whose main troubles in life include love, relationship, sex, money and drug. They are the ones who see some value and lessons to be learned through the show’s exploitation.

小题1: Compared with other TV talk shows, both the Jerry Springer and the Oprah Winfrey are ____.

A.more interesting

B.unusually popular

C.more detailed

D.more formal小题2:Though the social problems Jerry Springer talks about appear unpleasant, people who watch the shows____.

A.remain interested in them

B.are ready to face up to them

C.remain cold to them

D.are willing to get away from them小题3:Which of the following is likely to be a topic of the Oprah Winfrey show?

A.A new type of robot.

B.Nation hatred.

C.Family income planning.

D.Street accident.小题4:We can learn from the passage that the two talk shows_____.

A.have become the only ones of its kind

B.exploit the weaknesses in human nature

C.appear at different times of the day

D.attract different people