问题
选择题
1996年诺贝尔化学奖授予了对发现C60和C70有重大贡献的三位科学家。现在也已制得。对这两种物质的叙述，错误的是 [ ]
A．它们是两种新型的化合物
B．它们是碳元素的两种单质
C．它们的相对分子质量之差为120
D．它们都是由分子构成的
答案
答案：A
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1996年诺贝尔化学奖授予了对发现C60和C70有重大贡献的三位科学家。现在也已制得。对这两种物质的叙述，错误的是 [ ]
A．它们是两种新型的化合物
B．它们是碳元素的两种单质
C．它们的相对分子质量之差为120
D．它们都是由分子构成的
答案：A
| 完形填空。 | |||
| Tom had a beer in a bar and he was asked to pay $6.50 by the boss. "But I paid you just now. Don't you __1__ ?" Tom replied. "OK," said the boss, "If you said you paid, you did. " Then Tom __2__ the bar excitedly. When he met his friend, Jim, he told Jim his __3__ about what had just happened to him. "The boss of the bar doesn't have a good memory. He __4__ remember whether his customers have paid or not. Why not go to the bar and have a __5__ beer?" Tom suggested. To Jim, it sounded like a __6__ idea. He rushed into the bar,ordered two beers and later played the same trick (伎俩) on the boss. Jim paid __7__ for his beer. Soon, John heard Tom and Jim's stories. He didn't want to miss the chance to try his __8__. So John hurried into the bar. When he was drinking, the boss said, were drinking beer. Neither paid, __8__ both said that they had. The next guy who tries that trick will be __9__out of the window. " "Don't tell me about your problem," John said. "Just give me my change and I'll be on my way home. | |||
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