7. C　解析：态度推断题。本文作者只是客观地介绍了两项研究结果，并没有对现代跑鞋的使用发表自己的看法，因此选择C。

　　C

　　I hear this from people all the time：“It's expensive to eat healthily.” To be clear, I understand that organic bread is a lot more expensive than Pop Tarts, but I also know that you can't put a price tag on your health or your life. I also know that the same people who tell me they can't afford to eat healthily are spending upwards of $30 a week on coffee, $6 or $7 for a pack of cigarettes, and at least $3 every day at the vending machine, but they can't afford to buy fresh fruit because it's “too expensive”. Wake up, people!

　　You are either going to spend your money at the grocery store or the doctor's office. If you think buying a few extra bananas is expensive, try pricing out diabetes, cancer, heart disease, or any number of other diseases that can be controlled, or avoided through diet.

　　Eating well and taking care of yourself is not a privilege reserved for the well­off－it's a right that everyone should exercise! I'm not rich by any means, but I budget my money in such a way that I can afford to eat healthfully. Some weeks I may not be able to afford lots of organics and other specialty items, but I can always afford to throw a couple extra bananas and apples in my grocery cart, along with some vegetables and a dozen eggs.

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