题目

   In the USA, there are many types of restaurants. Fast food restaurants are very famous. You can find McDonald’s and Kentucky Fried Chicken in many countries around the world. You look at a menu above the counter, and say what you’d like to eat. You pay the person who serves you. You take your food and sit down or take it away. There’s no need to leave a tip.    In a coffee shop you sit at the counter or at a table. You don’t wait for the waitress to show you where to sit. She usually brings you coffee when you sit down. You tell her what you’d like to eat and she brin 下图表示某植物的非绿色器官在氧浓度为a、b、c、d时,CO2释放量和O2吸收量的变化。下列相关叙述正确的是 [  ] A. 氧浓度为a时,最适于贮藏该植物器官 B. 氧浓度为b时,无氧呼吸消耗葡萄糖的 量是有氧呼吸消耗量的5倍 C. 氧浓度为c时,无氧呼吸最弱 D. 氧浓度为d时,有氧呼吸强度与无氧呼吸强度相等
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