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go to Bernie’s place. We’d sit on the edge of the dock(碼頭), feet dangling(搖晃), and got ready for a big meal. Bernie would take his knife, cut our first watermelon, hand us both a big piece and sit down next to us. Then we’d bury our faces in watermelon, eating only the heart—the reddest, juiciest, firmest, sweetest, most seedfree part—and throw away the rest. Bernie was my father’s idea of a rich man. I always thought it was because he was such a successful businessman. Years later, I realized that it was not Bernie’s wealth itself but his way of dealing with it that my father liked. Bernie knew how to stop working, get together with friends and eat only the heart of the watermelon.What I learned from Bernie is that being rich is a state of mind. Some of us, no matter how much money we have, will never be free enough to eat only the heart of the watermelon. If you don’t take the time to dangle your feet over the dock and enjoy life’s small pleasure, your work is probably hurting your life. For many years, I forgot that lesson I’d learned as a kid on the loading dock. I was too busy making all the money I could. Well, I’ve relearned it. I hope I have time left to enjoy the success of others and to take pleasure in the day. That’s the heart of the watermelon. I have learned again to throw the rest away. 46. We learned from the second paragraph that the writer and his father were feeling ______. A. relaxed B. worried C. hungry D. proud47. How did the writer and his father eat the watermelon? A. They ate it in a polite way. B. They only ate its best part. C. They ate every part of it. D. They shared only one piece.48. In the eyes of the writer’s father, Bernie ______. A. was just a rich businessman B. worked hard all the time C. lived a rich but healthy life D. knew how to make money49. The underlined part “the heart of the watermelon” in the last paragraph refers to ______. A. the best part of the watermelon B. the writer’s busy life C. the writer’s decision of making money D. the writer’s hope of enjoying life50. It can be learned from the passage that ______. A. one has to work hard to reach his goal B. a friend in need is a friend in deed C. watermelon is the healthiest fruit D. one should keep worklife balanceBWhen the Audet family turns on the lights at Blue Farm, they are using electricity that es from cows—cow manure (糞肥), to be specific.Cows produce a lot of wastes. One cow can create 30 gallons of wastes each day. Now imagine the output of over 1,000 cows at Blue Farm. That’s really a big amount.When farmers clean their barns, they put the wastes in a big heap, and spread some of them on their fields for fertilizer(肥料). But now places like Blue Spruce Farm have a new way of using cow wastes. They use them to produce electricity.Here’s how it works: A big machine moves back and forth cleaning the barn floor. “The cows aren’t bothered,” says Marie Audet. “They are animals of habit。 they get used to it, and just lift one foot and then another to let it go by.” The machine pushes the manure into a big 600gallon tank like a small swimming pool. The tank is called a d