7．The twins are booked on differentflights ．——青夏教育精英家教网—

19．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，Josept 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．
9．Long ago，when the sick man was operated on，heB．
A．could feel nothing
B．could feel all the pain
C．could not want anything
D．could do anything
10．Using the laughing gas，the people did not seem toD．
A．he afraid of anything
B．be ill
C．want to go to the parties
D．feel pain
11．If a man took less laughing gas than he should have when an operation went on，heC．
A．felt nothing
B．would die
C．still felt pain
D．felt very comfortable
12．One who took too much of the laughing gasA．
A．would die
B．would laugh all the time
C．would never feel pain
D．would be very calm．

18．One day when Jack was walking in the park，he saw a woman，who lived a few miles away，sitting on a bench with a dog beside her．The dog was looking up at the woman．
Jack walked up to the woman and said，"Hello，Sue，how are you？May I sit and talk with you for a while？""Of course，please sit down，"Sue said．Jack sat down next to Sue on the bench，and they talked quietly together．The dog continued to look up at Sue，as if waiting to be fed．
"That's a nice dog，isn't he？"Jack said，pointing at the animal．
"Yes，he is．He's handsome．He's a bit of a mixture，but that's not a bad thing．He's strong and healthy．"
"And hungry，"Jack said．"He hasn't taken his eyes off you．He thinks you've got some food for him．"
"That's true，"Sue said．"But I haven't．"
They both laughed and ten Jack said，"Does your dog bite（咬人）？"
"No，"Sue said，"He's never bitten anyone．He's always gentle and friendly．"
Hearing this，Jack decided to hold out his hand and touched the animal'shead．Suddenly it jumped up and bit him．
"Hey!"Jack shouted．"You said your dog didn't bite．"
Sue replied in surprise，"Yeah，I did．But this is not my dog．My dog's at home．"
1．The dog looked at the woman becauseC．
A．the woman wanted to feed him
B．the woman was friendly
C．he was hungry
D．he was strong and healthy
2．Jack touched the dog because he believedA．
A．the dog was Sue‘s
B．Sue's dog was unfriendly
C．the dog was handsome
D．Sue's dog was at home
3．We can know form the passage thatB．
A．Sue gave a wrong answer
B．Jack made a mistake
C．the dog wasn't dangerous
D．both Jack and Sue liked the dog
4．Which of the Following can be the best title of the passage？A
A．A Wrong Question
B．Sue's Dog
C．A pleasant Meeting
D．Sue's Friend．

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