二、读课文,学生词:用本课生词的适当形式补全下面的短文 remove　economy　balance　cookie　importance　appeal　crop　contain　approximately　erosion 5 yuan may not mean too much for you.If buying a bag of candies or 1.　　　　　　 doesn’t 2.　　　　　　 to you,you can buy a tree instead.  Every year,3.　　　　　　　　　 1.6 billion tons of soil has been 4. 　　　　　　 from the land along the Yellow River.The soil 5. 　 　　　 materials which help keep the natural 6. 　　　　　 of the area and the loss of the land has caused serious 7. 　　　　　　. 

cookies

appeal

approximately

removed

contains

balance

erosion