若该商店计划电视机和洗衣机共100台，设购进电视机x台，获得的总利润y元．

① How much is it? ____     A. OK. Here you are.

② Can I try them on? ____     B. It's $89.

③ Is it too expensive? ____     C. It's very pretty.

④ How do you like this skirt? ____     D. Yes，it is.

下列有利于保持乐观心态的有（     ）

①学会爱别人，宽容别人              ②事事苛求他人 

③适当的体育锻炼                          ④学会自我调整，善于从不如意的处境中发现有价值的积极的一面