问题
选择题
日常生活常见的下列物质，属于化合物的是（ ）
A．天然气
B．钢
C．铁矿石
D．碳酸钙
答案
化合物指的是含有两种或两种以上元素的纯净物．
A、天然气是混合物，故A错；
B、钢是混合物，故B错；
C、铁矿石是混合物，故C错；
D、碳酸钙是纯净物，含有三种元素，是化合物，故D对．
故选：D
搜题请搜索小程序“爱下问搜题”
日常生活常见的下列物质，属于化合物的是（ ）
A．天然气
B．钢
C．铁矿石
D．碳酸钙
化合物指的是含有两种或两种以上元素的纯净物．
A、天然气是混合物，故A错；
B、钢是混合物，故B错；
C、铁矿石是混合物，故C错；
D、碳酸钙是纯净物，含有三种元素，是化合物，故D对．
故选：D
完形填空（共15小题，每小题1分，计15分） 阅读下面短文，掌握其大意，然后从各题所给的四个选项中选出一个最佳答案。 Denny Crook was a famous photographer. He traveled all over the world, taking pictures for magazines and newspapers, and won many prizes. “I’ll do ___1___ to get a good photo,” he often said. “I’ll go anywhere at any time, even if it is dangerous.”And he told the truth. He had photos of earthquakes, forest fires, floods and even wars. If something interesting happened, Denny went to 2 it. His wife often asked him to take her with him, but he always 3 .” I’ll travel for my work, not for 4 ,” he told her, “You won’t enjoy yourself, and I won’t have 5 to look after you. Sometimes there’s not even anywhere to 6 , and I have to sleep outside. I often don’t have a good 7 or a bath for days. You won’t like it.” “Denny, I’m not a child,” his wife didn’t 8 , “I can look after myself. Please take me with you the next time you go overseas.” Denny did not say anything, but he 9 about it, and when he was asked to go to Africa he said to his wife, “You can come to Africa with me if you want to. I’ll go to take photos of wild 10 there. It should be interesting and not too uncomfortable.” His wife was very 11 . When they got to Africa, the first day she had a very enjoyable time. The next day Denny went 12 to find some lions to photo. His wife went with him, but soon they became separated (分开). She walked down one path while he walked down the other. Suddenly, Denny heard her 13 . He ran back and saw her running toward him. A huge lion was chasing her. Quickly Denny took his camera out of its case and 14 it at his wife and the lion. Then he shouted, “ 15 , woman! I can’t get you both in the picture!”
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