问题
不定项选择题
下列说法中不正确的是 [ ]
A．相对分子质量相同，组成元素的百分含量相同的不同有机物一定是同分异构体关系
B．碳原子数相同、结构不同的烷烃一定是互为同分异构体关系
C．两有机物互为同系物，则它们也是互为同分异构体关系
D．碳原子数≤10的烷烃，其一氯代物没有同分异构体的烷烃有4种
答案
答案：C
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下列说法中不正确的是 [ ]
A．相对分子质量相同，组成元素的百分含量相同的不同有机物一定是同分异构体关系
B．碳原子数相同、结构不同的烷烃一定是互为同分异构体关系
C．两有机物互为同系物，则它们也是互为同分异构体关系
D．碳原子数≤10的烷烃，其一氯代物没有同分异构体的烷烃有4种
答案：C
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| One day a young man had to stop his car soon after he started for London because he heard a strange noise from the back of his car. He 1 and examined the wheels carefully, but as he found 2 wrong, he went on. The noise began at once and now it was even louder. He turned his head and saw something that looked like a big, dark cloud following his car. When he 3 at a village, he was told that a queen bee (蜂后) must be somewhere 4 his car as there were thousands of bees around. To get away from the bees, the man drove away 5 and after some time arrived in London. He 6 his car outside a house and went in to have a drink. 7 a door- keeper hurried in to tell him that his car was covered with bees. The poor young man 8 telephone the policeman and told him what had happened. The policeman sent him a bee-keeper (养蜂人). The bee-keeper soon found the passenger, a queen bee, near the wheel. He was very 9 to the young man for his present. He took the bees 10 in a box. The young man drove away happily. | ||||
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