在晴天中午，密闭的玻璃温室中栽培的玉米，即使温度及水分条件适宜，光合速率仍然较低，其主要原因是

____

排序并填表．

红旗小学四（一）班和四（二）班比赛100米短跑，规定三盘两胜为胜．

（一）班跑得快的是小张、小明、小兰．分别为9.2秒、9.5秒、9.9秒；

（二）班跑得快的是为小刚、小强、小红，分别为9.3秒、9.5秒、9.7秒．如果（二）班要胜（一）班（二）班应该如何派出选手？

补全对话, 其中有两个多余选项。

(D=Darren, C=Carol)

D: Hi. Carol! ____

C: Oh, hi, Darren. I’m just getting ready for the Red Nose Day concert tomorrow.

D: Oh, really? Well, I’m free this afternoon. ____

C: Actually, I’ve nearly finished. Jim and I are going to put up some ads later, though. Could you please help us with that?

D: ____

C: That’s wonderful! Oh, there’s one more thing. Would you mind coming early tomorrow to help sell tickets at the door?

D: Not at all. ____

C: Around six would be great.

D: OK. ____

C: Great.