Eating pasta or beans at least once a week instead of meat would increase your dollars further. For example, if a family of four replaced a meatless spaghetti dinner ($1.29 a pound) for roast beef ($7.32 for one and a half pounds), they would save around $6. That’s an annual savings of $312.

　　When it comes to global warming, not all meat is created equal. The ruminants(反刍动物) Americans eat, mainly cows, cause the biggest threat to the climate, according to an article in this month’s edition of the journal Nature Climate Change.

　　The good news is that Americans have been eating less meat, including beef, over the last decade. Annual US beef consumption dropped from its high point of 97 pounds per person in 2002 to 81 pounds in 2011, according to US Department of Agriculture data. But that is still more than consumers in every other country besides Argentina, Brazil and Uruguay.

　　1. The second paragraph is developed mainly by ________.

　　A. listing detailed causes

　　B. following the order of space

　　C. making comparisons

　　D. giving explanations

　　2. A pound of beef steak is more expensive than a pound of boneless chicken breasts by ________.

　　A. $2.80

　　B. $2.88

　　C. $1.52

　　D. $3.87

　　3. From the passage, we can know that ________.

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