下列关于蒸发和沸腾的说法正确的是（ ）
A．蒸发和沸腾是汽化的两种方式
B．沸腾需要吸热，而蒸发不需要吸热
C．蒸发和沸腾都只能在一定温度下发生
D．蒸发和沸腾都只能在液体表面发生
A、蒸发和沸腾是汽化的两种方式，所以A是正确的；
B、沸腾和蒸发都是汽化现象，汽化要吸热，所以B是错误的；
C、蒸发是在任何温度下都可以进行的汽化现象，所以C是错误的；
D、沸腾是液体表面和内部同时发生的汽化现象，所以D是错误的．
故选A．
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| Some people believe that dreams can tell them what will happen in the future. 1 knows why this is so, but there are many stories about people who had dreams that 2 . One of the these people was a man 3 John Chapman, who lived in Swaffham in England many years ago. John Chapman dreamt that he 4 on London Bridge and a man told him how to become rich. John Chapman was a poor man and he needed 5 , so the next day he decided to leave for London. 6 was 100 miles from Swaffham to London. He walked for few days and at last he 7 London Bridge. There were many people on the bridge, but they weren't 8 in John Chapman. No one 9 him. After three days, John Chapman decided to go home, 10 before he could do this, a shopkeeper came up to him. "I've been watching you," he said,"Are you 11 someone?" "Yes," said John,"I had a dream about a man here. He would help me to get much money." "Oh," said the shopkeeper,"You shouldn't believe in dreams. 12 I believe in dreams, I'd be in Swaffham right now. I had a dream a few days ago about a man called John Chapman from Swaffham. He had 13 in his garden, near an old apple tree." John Chapman was 14 by what the shopkeeper said. At once he went home and dug near an old apple tree. He soon found many pieces of gold. He was so happy 15 he gave some of the gold to his church. For the rest of his life, he was a rich man. | ||||
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