题目

如图所示，一根轻质弹簧左端固定，现使滑块沿光滑水平桌面滑向弹簧，在滑块接触到弹簧直到速度减为零的过程中，弹簧的（） A . 弹力越来越大，弹性势能越来越大 B . 弹力越来越小，弹性势能越来越小 C . 弹力先变小后变大，弹性势能越来越小 D . 弹力先变大后变小，弹性势能越来越大 答案：A 阅读理解。 　　My name is Cindy．I'm thirteen years old this year．I'm a middle school student．I'm in Class Three,Grade Seven．I have some new subjects this year．They are science and history．My favorite day is Thursday because I have science on that day． 　　I have a twin sister(孪生姐姐)．Her name is Sonia．She is also a middle school student．She is in Class Six,Grade Seven．She likes English．Her favorite day is Monday because she has English on that day． 　　My father is Mr.White．He is a math teacher．His favorite day is Sunday because he can go to the baseball club．He likes playing baseball． 　　My mother is Mrs.White．She is a clerk at Huaxing Clothes Store．Her favorite day is Saturday because on that day she doesn't go to work．And she can play tennis with her friends．Oh,my mother likes playing tennis． (1) Cindy's favorite subject is ________． [　　] A． science B． history C． math D． English (2) Sonia is ________ years old this year． [　　] A． seven B． nine C． thirteen D． fourteen (3) Mr.White has two ________． [　　] A． sons B． sisters C． brothers D． daughters (4) On ________,Mr.White usually goes to the baseball club． [　　] A． Saturday B． Monday C． Thursday D． Sunday (5) Mrs.White works in a ________． [　　] A． club B． hotel C． school D． store