如图所示的四个事例中，目的是为了减小摩擦的是（　　）

下列实验方法或原理正确的是（　　）

解释下列词语的意思。

①千山  ②万径  ③孤舟  ④寒江

Dear Jenny,
   Please take these things to your brother: his math book, baseball, notebook, CDs, and video tape. The math book is on the dresser. The baseball is under the bed. The notebook is on the bed. The CDs are in the drawer. The video tape is on the table. Thanks!
                                                                                                                                                                            Mom