听力:填写单词及阿拉伯数字 PROBLEM People 1. old items. Only 2. % are recycled; the rest go in the 3. SOLUTION 4 and 5 older appliances, or safely 6 . them. PROBLEM There are almost 7 cars on the road worldwide. They use 8. % of the world’s oil and create 9 % of the world’s air pollution. SOLUTION Cities need to make it easy to 10. , 11. , or use public transportation. PROBLEM Producing less than 12 grams of beef requires13. liters of water, which is wasteful. Large numbers of animals also live in small spaces, which can lead to the spread of 14 SOLUTION People need to 15 less 16 .