句子模仿秀。     

例：水龙头——节约每一滴水，它将会带给你清新明亮的世界。     

1．操场上——                                                                                                                                      

2．楼梯边——                                                                                                                                      

半衰期是46.3小时的核素是（）。

A.⁸⁹Sr

B.¹⁵³Sm-EDTMP

C.¹⁸⁶Re-HEDP

D.³²P

E.⁹⁰Y