9. A) They pollute the soil used to cover them

　　B) They are harmful to nearby neighborhoods

　　C) The rubbish in them takes long to dissolve

　　D) The gas they emit is extremely poisonous

　　10. A) Growing populations C) Changed eating habits

　　B) Packaging materials D) Lower production cost

　　11. A) By saving energy C) By reducing poisonous wastes

　　B) By using less aluminum D) By making the most of materials

　　12. A) We are running out of natural resources soon

　　B) Only combined efforts can make a difference

　　C) The waste problem will eventually hurt all of us

　　D) All of us can actually benefit from recycling

　　Questions 13 to 15 are based on the conversation you have just heard.

　　13. A) Miami C) Bellingham

　　B) Vancouver D) Boston

　　14. A) To get information on one-way tickets to Canada

　　B) To inquire about the price of “Super saver ” seats

　　C) To get advice on how to fly as cheaply as possible

　　D) To inquire about the shortest route to drive home

　　15. A) Join a tourist group C) Avoid trips in public holidays

　　B) Choose a major airline D) Book tickets as early as possible

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