题目

下列表示呼吸作用的公式中，正确的是（  ）。   A.二氧化碳 + 水 → 有机物 + 氧气 B.二氧化碳 + 有机物 → 水 + 氧气 + 能量 C.有机物 + 氧气 → 二氧化碳 + 水 + 能量 D.有机物 + 氧气 → 二氧化碳 + 水 答案：CNot all advertising is about selling products and services for a profit.  31  contemporary advertisements mainly aim to make contributions to  32 . There are public advertisements which 33   citizens to participate in improving their neighborhood, protecting the environment, and helping other people. Over the last decade, the government has worked hard at using advertisements to educate the  34  on fighting AIDS, saving water, helping the poor, giving up smoking, etc. These advertisements have helped to increase public knowledge,  35  has made our society a better place for everyone. 31. A. SomeB. No  C. All  D. Few32. A. marketB. society  C. wealth D. education33. A. orderB. help   C. encourageD. allow34. A. studentsB. government C. neighborhoodD. public35. A. it   B. whatC. thatD. which