问题
单项选择题
下列各项应用中，不是利用细胞呼吸原理的是（）
A.手指受伤时，选择透气的消毒纱布包扎
B.稻田定期排水
C.光照下适当增加作物环境中CO2 的浓度
D.利用葡萄、粮食和酵母菌制酒
答案
参考答案：C
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下列各项应用中，不是利用细胞呼吸原理的是（）
A.手指受伤时，选择透气的消毒纱布包扎
B.稻田定期排水
C.光照下适当增加作物环境中CO2 的浓度
D.利用葡萄、粮食和酵母菌制酒
参考答案：C
| 完形填空。 From Monday to Friday most people are busy working or studying, but in the evenings and weekends they are free and 1 themselves. Some watch television or go to the movies and others take part in sports. This is decided by their own 2 . There are many different ways to spend our 3 time. Almost everyone has some kind of 4 it may be something from collecting stamps to 5 model planes. Some hobbies are very expensive but others don't cost anything at all. Some collections are worth a lot of money but others are 6 only to their owners. I know a man. He has a coin collection worth (值) thousands of dollars. A short time ago he bought a rare (珍贵的) fifty-cent piece. It 7 him ＄250! He was very happy about this collection and thought the price was all right. On the other hand, my youngest brother collects match boxes. He has almost 600 of them, but I wonder 8 they are worth any money. However, to my brother they are quite valuable. 9 makes him happier than to find a new match box for his collection. That's what a hobby means, I think. It is something we 10 to do in our free time just for the fun of it. The value in dollars is not important, but the pleasure it gives us is. | ||||
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