题目

用含18O的葡萄糖跟踪有氧呼吸过程中的氧原子，18O的转移途径是（    ） A．葡萄糖→丙酮酸→水          B．葡萄糖→丙酮酸→氧 C．葡萄糖→丙酮酸→CO2          D．葡萄糖→氧→水 答案：C     I'd like to say something about the canteen service in our school.In general,the service is________(满意)．The 1.________hall is clean and tidy.The dishes look inviting and tasted________ as well.What's more,the workers 2.________there treat us as their friends,________makes us 3.________feel  very happy.However,the________(价格) of 4.________the meals is a little too high.Besides,we can only have a few dishes to c________from and the canteen is5.________ ________(拥挤)．As a result, we often have to 6.________stand in line for a long time________we can get  7.________the  meal. You could understand what difficulty we________in dealing with the three meals  every 8.________day .May  I suggest  something________done  to  9.________  s________ the problems so that we can all enjoy 10.________our meals at school?