学习目标
1.   词汇
      several  shelf  already  knowledge  schoolyard   step  librarian  probably  sadly  bookmark  encourage  once  abroad  copy  as
      CD player    used to    put down    pay for 
      come up with    think of      get back     pick up
2．日常交际用语
      I  have got a book.
      Have you got……? Yes , I have.  No , I haven’t.
      Have you ever done……?
      I’ve just done……
语法
      现在完成时的构成 ; 陈述句形式、疑问句形式和简略答语; 动词的过去式和过去分词