问题 填空题

(7分)用电石和水反应,产生的乙炔中含有H2S等杂质。某学生拟选用①NaOH溶液、②KMnO4溶液、③CuSO4溶液、④浓HNO3、⑤浓H2SO4中的一种除去H2S杂质,经研究最后他确定选用的溶液是    (填序号),如果没有该试剂,请你用其它试剂代替(写一种化学式)     。选用前者而发生的离子方程式为                   。但这一方程式所表示的制取原理与一般的情况有所不同,如强制弱、稳定制不稳定、难挥发制易挥发等,请用离子方程式表述将稀盐酸逐滴滴加到NaOH和Na2CO3混合溶液中的变化过程:                                                             

答案

③  (CH3COO)2Pb  Cu2++H2S= CuS↓+2H+

H++OH-=H2O      H++ CO32-= HCO3-       H+ +HCO3- =H2O+ CO2

阅读理解

One girl decided to study judo(柔道)although she had lost her left arm in a car accident.

The girl began lessons with an old Japanese judo instructor. The girl was doing well. So she couldn’t understand why, after three months of training, the instructor had taught her only one move.

“Instructor,” the girl finally said, “Shuldn’t I be learning more moves?”

“This is the only move you know, but this is the only move you’ll ever need to know,” the instructor replied.

Not quite understanding, but believing in her teacher, the girl kept training.

Several months later, the instructor took the girl to her first tournament. Surprising herself, the girl easily won her first two matches. The third match proved to be more difficult, but after some time, her opponent became impatient and charged. The girl skillfully used her one move to win the match. Still amazed by her success, the girl was now in the finals.

This time, her opponent was bigger, stronger and more experienced. For a while, the girl appeared to be overmatched. Concerned that the girl might get hurt, the referee called a time-out. She was about to stop the match when the instructor intervened(干预).

“No,” the instructor insisted, “Let her continue.”

Soon after the match restarted, her opponent made a serious mistake; she dropped her guard. Instantly, the girl used her move to pin her opponent. The girl had won the match and the tournament. She was the champion.

One the way home, the girl and her teacher reviewed every move in each and every match. Then the girl gathered the courage to ask what was really on her mind.

“Instructor, how did I win the tournament with only one move?”

“You won for two reasons,” the teacher answered. “First, you’ve almost mastered one of the most difficult throws in all of judo. Second, the only known defense for that move is for your opponent to grab your Left arm.”

The girl’s biggest weakness had become her biggest strength.

小题1:What can we learn about the girl?

A.She was disabled in an accident.

B.She disliked judo training.

C.She learnt several moves.

D.She won the first two matches hard.小题2:The underlined word “overmatched” probably means         .

A.impatient

B.depressed

C.defeated

D.trapped小题3:The girl won the championship because of          .

A.her bravery

B.her skills

C.her tricks

D.her strength小题4:Which of the following is probably the best title of the story?

A.The Story of a Girl.

B.A Disabled Girl.

C.Defense Matters.

D.Weakness Becomes Strengh.

单项选择题