4．解析：考查推断。人们都患上了一种通病：开车太多，很少步行。作者回忆了以前人们经常步行，步行有很多好处，作者鼓励人们走路，少开车。

　　答案：D

　　B

　　Now 16 years old, Kelsey has her cow－Iris, a 6­year­old Jersey with a silky tan coat and soulful brown eyes. She also has established Fort Bantam Creamery, a one­cow dairy based on a self­designed and profitable cow­share program.

　　Kelsey's Fort Banlam Creamery customers purchase a share of Iris for $15, and then pay a fee to Kelsey ($3.50 per half gallon of milk) to board, care for and milk that share of the cow. At $3. 50 per half gallon, Iris' milk is about double the cost of milk from grocery stores in the area, but no one is complaining. One of Iris' shareholders drives more than 100 miles round trip to get the milk, on top of paying a $15 ferry toll.

　　Kelsey had her own ideas for Iris' care. She says she wanted her cow to be grass­fed because milk from grass­fed cows is higher in carotene (胡萝卜素) and vitamin E than milk from grain­fed cows. In part, that's because fresh grass has more of these nutrients than grain. Another factor behind the high nutrient content is that a grass­fed cow produces less milk than a grain­fed cow, and because any given cow has only a set amount of vitamins to transfer to her milk; the less milk she produces, the more vitamins are in each glass.

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