阅读理解No one is glad to hear that his body has to be cut open

阅读理解
No one is glad to hear that his body has to be cut open by a surgeon（外科医生） and part of it taken out.Today,however,we needn't worry about feeling pain during the operation.The sick person falls into a kind of sleep,and when he awakes,the operation is finished.But these happy conditions are fairly new.It is not many years since a man who had to have operation felt all its pain.
Long ago,operation had usually to be done while the sick man could feel everything.The sick man had to be held down on a table by force while the doctors did their best for him.He could feel all the pain if his leg or arm was being cut off,and his fearful cries filled the room and the hearts of those who watched.
Soon after 1770,Joseph Priestley discovered a gas which is now called "laughing gas".Laughing gas became known in America.Young men and women went to parties to try it.Most of them spent their time laughing,but one man at a party,Horace Wells,noticed that people didn't seem to feel pain when they were using this gas.He decided to make an experiment on himself.He asked a friend to help him.Wells took some of the gas,and his friend pulled out one of Well's teeth.Wells felt no pain at all.As he didn't know enough about laughing gas,he gave a man less gas than he should have.The man cried out with pain when his tooth was being pulled out.Wells tried again,but this time he gave too much of the gas,and the man died.Wells never forgot this terrible event.
6 It is _______ since a man being operated felt all the pain.
A a few more years
B not long
C few years
D two thousand years
7 Long ago,when the sick man was operated on,he _______ .
A could feel nothing
B could not want anything
C could feel all the pain
D could do anything
8 Using the laughing gas,the people did not seem to _______ .
A be afraid of anything
B feel pain
C want to go to the parties
D be ill
9 If a man took less laughing gas than he should have when an operation went on,he _______ .
A felt nothing
B felt very comfortable（舒服的）
C still felt pain
D would die
10 One who took too much of the laughing gas _______ .
A would laugh all the time
B would die
C would never feel pain
D would be very calm
9 If a man took less laughing gas than he should have when an operation went on,he _______ .
A felt nothing
B felt very comfortable（舒服的）
C still felt pain
D would die
到底选哪个？A还是C？

6. B 从“when he awakes, the operation is finished”可知时间不长
7. C 从the sick man could feel everything He could feel all the pain可知
8. B 从noticed that people didn't seem to feel pain when they were using this gas可知
9. C 从The man cried out with pain when his tooth was being pulled out.可知
10. B 从he gave too much of the gas, and the man died可知
9.选C 因为he gave a man less gas than he should have. The man cried out with pain 可知笑气少的话他还是可以感觉到疼痛