问题 选择题

下列有关实验操作、实验结论和说法正确的是

A.粗略配制浓度为2 mol·L—1的NaCl溶液,可将58.5gNaCl加入到盛有500mL水的烧杯中,搅拌、溶解

B.将滴定管洗净,再用蒸馏水润洗后,即可注入标准液进行滴定

C.向乙酸乙酯中加入稀NaOH溶液,振荡,分液,可除去乙酸乙酯中的少量乙酸

D.为验证氯仿中含有的氯元素,可向氯仿中加入NaOH溶液,加热充分反应后,再加入AgNO3,观察到白色沉淀

答案

答案:A

B不正确,滴定管必须用标准液润洗。C不正确,应该用饱和碳酸钠溶液。D不正确,再加入硝酸银溶液之前,首先要加入硝酸进行酸化。所以正确的答案选A。

阅读理解

阅读理解。

     In the US, the most popular way to welcome the new year is with a big party. Some parties are at private

homes. But in recent years, it has become more and more common for Americans to go to a hotel or

eating-place on the night of December 31st. There, they can eat a big dinner, drink champagne, and dance to

orchestra music.    

     Most New Year's parties are usually noisy. People shout and sing. And often, guests blow on small

noisemakers when the new year arrives at midnight. This tradition of noise making is believed to start centuries

ago. People thought that loud sounds would drive away the bad spirits of the old year.

    The biggest, noisiest New Year's party in the US takes place in Times Square in New York. Thousands of

people gather (聚集) there. Some of them ring bells and set fireworks. Others blow whistles of car horns (喇叭). And at twelve o'clock, they begin to cheer as an electric sign in the shape of a red apple lights up on top

of a tall building.

     The Times Square celebration includes another well-known American tradition. Since 1929, the band of

musician Guy Lombardo has given a concert on New Year's Eve. Guy Lombardo died in 1977. But, Bill

Lombardo, has kept the tradition alive with a band concert at a New York city hotel. When the crowds in

Times Square start cheering the arrival of the new year, television cameras show the band playing the song

Auld Lang Syne.

1. The most usual way to welcome the new year in the US is _________.

A. to go shopping

B. to meet friends

C. to travel abroad

D. to hold a big party

2. The biggest New Year's party in the US is _________.

A. in Central Park

B. in Hollywood

C. in Times Square

D. in Disneyland

3. In the past, some American people made big noise when the new year arrived _________.

A. to express their friendship

B. to drive away the bad spirits

C. to make others more excited

D. to give best wishes to each other

4. In 1929 a concert on New Year's Eve was given by _________.

A. the band of Guy Lombardo

B. the band of Bill Lombardo

C. the band of Johann Strauss

D. the band of Elvis Aaron Presley

选择题