小明进入初中以来，课堂上不遵守纪律，从来没有独立完成过老师布置的作业，每天都是在文曲星上打游戏，全班同学在玩游戏上谁也比不过他。他说：“我家里有的是钱，将来照样能找一份好工作。”让我们来帮一帮小明，目前他首先应该（    ）

两个数4000000004和5000000005的乘积的各位数字和是____ ．

运用细胞工程技术获得单克隆抗体时，必要的操作是

⑴What's your favourite season?____                           A. It's sunny and cool.

⑵Why do you like winter?____                                    B. I can swim.

⑶I like spring.____                                                       C. Autumn.

⑷What can you do in summer?____                           D. Because I can skate.

⑸What's the weather like in autumn in Beijing?____  E. Me too.