小明在暑假里可没有闲着，他先是陪爸爸妈妈外出旅游，认识了祖国的山川河流：到科技馆、博物馆做义务讲解员；到敬老院去献爱心…，他的做法是（    ）

①积极探索世界的奥妙

②享受学习的快乐

③缺乏艰苦奋斗精神，乱花钱

④善于从生活的多个方面汲取学习养料

如图为人体心脏解剖图，其中与〔②〕相连的血管是（    ）

阅读理解
    American country music is also known as(被称为)country Western music．It has a very long history．It comes from the folk songs of immigrants(移民)from Britain．
    Country music uses simple music and words to express everyday feelings such as loneliness，love，and sadness．That is to say，country music describes life．It talks about friends and enemies，trucks and roads，farms and crops．People in many parts of the world like country music，because everyone can understand what the music is about．
    Country Western music became popular first among cowboys(牛仔)in the American West courttryside．Cowboys had to take care of cows day and night．When they were alone with the cows，they often sang beautiful and peaceful songs to calm the animals and to overcome their own fear．They were not well—educated and so they sang about their daily life in very simpie words．They played guitars，violins，and other instruments．  In the south of America，many people added instruments from their homes，like bottles and spoons．  When cowboys visited their friends and families on holidays like Thanksgiving，they usually sang and played country Western music．
    In recent years，many musicians have made country Western music a little different from the one in the past．These changes make the songs sound even better．Today singers such as Garth Brooks， Reba McEntire，Emmylou Harris，Lyle Lovett，Eddie Rabbitt，LeAnn Rimes，Randy Travis，and a group called Alabama are singing and playing in different styles．They have brought country Western music more and more fans from all over the world．

想一想再写一个

弯弯的(小路)____ 长长的(柳枝) ____ 蒙蒙的(细雨)____

温暖的(春风)____  晶莹的(露珠)____

2的相反数是____．