A：CO和CO2组成元素相同，所以它们的化学性质也相同
B：碳在空气中充分燃烧时生成CO2，不充分燃烧时生成CO
C：CO用于冶炼金属、做气体燃料；CO2用于人工降雨、灭火
D：清明上河图至今图案清晰可见，是因为在常温下碳单质的化学性质稳定
My mother and I are in the shop(商店). We'll buy(买)some fruit. There are many apples, bananas, oranges, pears and watermelons. How much are they? Four yuan for a kilo(千克) of apples. Two yuan for a kilo of bananas. Three yuan for a kilo of oranges. Five yuan for a kilo of pears. One yuan for a kilo of watermelons. We'll take some.
