已知函数y=2sinx的定义域为a，b，值域为﹣2，1，则b﹣a的值不可能是（　　）

①私营企业和外资企业的职工所获得的工资、奖金

②私营企业和外资企业的企业主凭借劳动获得的收入

③银行存款和购买债券获得的利息

④各种正当的资产租赁收入

革命老人谢觉哉说过“快乐是从艰苦中来的，只有经过劳作、奋斗得来的快乐，才是真快乐。不可能有从天上掉下来一个快乐给你享受”这句格言启迪我们（    ）

根据短文内容和所给汉语及首字母提示，用正确的单词完成短文。每空限填一词。

Dear Eric,

    We have some interesting and fun ____ (事情) this term. On ____ (九月) 28th, we have a school ____ (旅行). We will go to Yuliao Beach. We have an a____ festival on October 22nd. I can play the piano in the festival. On November ____ (第十二), we have a basketball game in our school. Do you like sports? Please come to our school ____ (在) November. On J____—the first ____ (月) of a year, we have a New Year ____ (晚会).

This is a really ____(忙绿的) term. I think we will have a good time.

                                                                                                                                                                             Yours,

                                                                                                                                                                               Gina