如图，M、N、P、R分别是数轴上四个整数所对应的点，其中有一点是原点，并且MN=NP=PR=1．数a对应的点在M与N之间，数b对应的点在P与R之间，若数a的对应点与数b的对应点之间相距2个单位长度，则原点是(    )

蚯蚓的食物有（     ）

①有机废物   ②生活垃圾   ③石头瓦块    ④玻璃金属

【甲】

       谢太傅寒雪日内集，与儿女讲论文义。俄而雪骤，公欣然曰：“白雪纷纷何所似？”兄子胡儿曰：“撒盐空中差可拟。”兄女曰：“未若柳絮因风起。”公大笑乐。即公大兄无奕女，左将军王凝之妻也。

【乙】

       梁国杨氏子九岁，甚．聪惠。孔君平①诣②其父，父不在，乃呼儿出。为设孔指以示儿曰：“此是君家果。”儿应声答曰：“未闻孔雀是夫子家禽。”③果，果有杨梅。

                                                                                                                                                                                          （选自《世说新语》）

      【注释】①孔君平：孔坦，字君平，官至廷尉。②诣（yì）：拜访，拜见。③设：摆放，摆设。

   My friend Tony is an American1 . He is ten years old. He lives2his family in China now. There are3 people in his family; his mother Mrs. Green, his father Mr. Green and his little sister Amy. He has a white cat.4name is Betty. Look！Amy is playing5 Betty. His father, Mr. Green, is watc­hing TV. His mother is doing housework. What about Tony? He is doing6Chinese homework. He can't  7Chinese well, but he likes Chinese very much. Tony's8works in a TV station. His father works in a school as an9 teacher. Tony and his sister  10 to the same school.