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  3. Long ago, an operation had usually to be done while the sick man could feel everything. The sick man had to be held down on a ta

Long ago, an operation had usually to be done while the sick man could feel everything. The sick man had to be held down on a ta

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问题     Long ago, an 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 Wells’ 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.
Wells did the experiment again and again in order to________.
选项 A、test the quality of laughing gas
B、practise doing an operation
C、make laughing gas himself
D、find out the right dose of laughing gas
答案D
解析 根据最后两段的两个例子可知，如果“笑气”的剂量使用少了。在拔牙时人仍会感到疼痛，而如果使用多了则会导致人死亡。由此可推知，Wells做了一次又一次的实验是为了弄清使用“笑气”的合适剂量。故选D。
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