问题
选择题
下列各组混合物中，不论二者以什么比例混合，只要总质量一定，完全燃烧时生成H2O的质量也一定的是
A．乙炔、苯
B．乙醇、乙醚
C．甲烷、乙烯
D．甘油、甲苯
答案
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下列各组混合物中，不论二者以什么比例混合，只要总质量一定，完全燃烧时生成H2O的质量也一定的是
A．乙炔、苯
B．乙醇、乙醚
C．甲烷、乙烯
D．甘油、甲苯
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When Mark left school, he did not really know what he wanted to do. He 36 worked in an office but he found that it was very boring. He did the 37 things day after day. This was also the trouble with his second 38 in a car factory. He then decided he would like to work out of doors and got a job 39 a gardener working in one of London’s 40 . He now works much harder than he 41 in the office or at the factory, but his work is quite different. There are, in all, 42 seasons in a year and each has its own special jobs for a 43 . He works harder in the autumn and winter keeping the park tidy and 44 for the spring and summer. In the summer he can relax(休息) and feel proud(自豪的) that he has helped to 45 the park so beautiful. Many people 46 the park then and he is always pleased 47 he hears them say how lovely it looks. Mark has made a lot of friends during his four 48 at the park. Many office workers come every 49 to eat their lunchtime sandwiches and feed the ducks. They often have talks with him and are 50 to find that he once worked in an office.
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