One afternoon I was sitting at my favorite table in a restaurant, waiting for the food I had ordered to arrive. Suddenly I ___36___ that a man sitting at a table near the window kept glancing in my di
The cost of organic food is higher than ___________ of conventional food because the organic price tag reflects more closely the true cost of growing the food． A. it
，则等腰梯形的腰长是________cm． 
AD，又∵DE=CF=