20. A. So long as

　　B. If only

　　C. Now that

　　D. Even though

　　Ⅲ. 阅读理解

　　Does it annoy you when your parents make you drink a carton of milk when you want a can of soda? Or do you hate being told to go for a run when your favorite TV show is on?

　　Well, maybe you should listen to your parents because they are only trying to help you. Without proper diet and exercise kids are at risk of developing fragile bones when they get older. That’s because our bodies are very good at building bones until about the age of 30, when the process stops.

　　Dr. Lawrence Raisz, scientific editor of The 2004 Surgeon General’s Report on Bone Health and Osteoporosis(骨质疏松症), agrees. “We’re in bad shape, ”he says. His report predicts that by 2020, half of all Americans over the age of 50 will be at risk of fractures(骨折)because of low bone mass. “Kids today are—what’s the expression? —they’re computer potatoes. They have lots of soft drinks and not enough good calcium-rich(富含钙质的)food. ”And there in(在其中)lies the problem, because calcium and exercise, along with vitamin D, are the important components for building up strong bones.

　　If you think of your body as a house, then your skeleton(骨架)is the supporting frame—a frame maintained and strengthened by calcium. Once we hit our 30s, our bodies start to draw from the calcium stored in our bones. If there is enough calcium, then the structure will stand firm, but if there’s not? Picture the frame of a house devoured(吞噬)by termites(白蚁), the wood brittle(易折的)and filled with holes”. That’s what osteoporosis does to your skeleton.

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