问题
单项选择题
工业乙炔含有杂质（），在温度为100℃时就会自燃。
A、PH3
B、HS2
C、H2S
答案
参考答案：A
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工业乙炔含有杂质（），在温度为100℃时就会自燃。
A、PH3
B、HS2
C、H2S
参考答案：A
B One night a hotel caught fire(失火), and the people in the hotel ran out in their 61 clothes. Two men stood outside and looked at the fire. “ 62 I came out, ” said one, “I ran into some of the rooms and found a lot of 63 . People don’t think of money when they are 64 . When anyone leaves paper money in a fire, the fire 65 it. So I took all the money I could find. 66 will become poorer because I took them.” “You don’t know me, ” said the other, “and you 67 my work.” “What’s your work?” “I’m a policeman.” “Oh!” 68 the first man. He thought quickly and said, “And do you know my 69 ? I’m a writer. I’m always telling stories about the things that 70 happened. ”
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