选出相对应的答语。

①I can hear the car. ____         A. Yes, I do.

②What is it? ____                     B. It's brown.

③Can you hear a cat? ____       C. Yes, I can.

④What colour is the dog? ____ D. Great.

⑤Do you like the train? ____      E. Yes. It's hard.

⑥Is the watch hard? ____           F. It's a bike.

除病毒外，绝大多数生物都是由细胞构成的，细胞是生物体的____和____单位．

在校运会上，小明打破了校初中男子100米校运会记录，在一片赞许声中，小明登上领奖台，此时，小明的心里格外激动。因为（      ）