A：I draw pictures for my friend.
B：I draw pictures for my story.
C：I draw pictures for my mother.
机体在一定时间内，呼吸作用产生的CO2 mol数与消耗的O2 mol数比值，常被用来判断呼吸分解有机物的种类。根据葡萄糖彻底氧化分解反应式计算，此比值应是 （ ）
依据达尔文进化论的观点，人类起源于（ ）
⑴Here you are.____ A. Yes, I do.
⑵Is this your watch?____ B. It's a watch.
⑶What's it?____ C. Thank you.
⑷Do you like apples?____ D. No,it isn't.
