第二部分: 完型填空(共20小题;每小题1.5分,满分30分) 阅读下面短文,从短文后所给各题的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项 Have you ever had problems in your life and don’t know how to be happy? If 36, you will find “Being a Happy Teenager” by Australian writer Andrew Matthews 37. In his book, Matthews 38 us how to have a happy life and answer the 39 of teenagers. There are many 40 such as parents and friends, and the book 41 we should stop being angry and forgive. The book tell下列人类活动,不合理的是A.营造“三北”防护林B.山坡地上毁林造田C.黄土高原植树造林,保持水土D.退耕还林,还草