不属于一次环境污染物的是（）

A.SO2

B.可吸入颗粒物

C.甲基汞

D.NO

E.CO2

五、短文填词

Do you like friends who can teach you a lot every day? Books are s    friends because they bring knowledge to us and keep us ____(陪伴) through our life. They are so valuable that libraries are b______ to        keep them. A____ all great men are lovers of books. Franklin said that it was books that led him to success and that he could have a______(获得) nothing without books. Books are the holders of mankind’s _______(经验) and imagination. They enable us to see through the past and predict the        . So when you open a book, you would get into a world ______ you have never been before. A good book is a good teacher that h       you to get over difficulties. No matter what you are, _______or old, poor or rich, books are your devoted friends.   

1. ___________  2. ___________3. ___________4. ___________5. ___________

6. ___________7. ___________8. __________9. ___________10.___________