阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项。

　　Some years ago in South Florida, a little boy went for a swim in the old swimming hole behind his home．In the hurry, he 　　1　　 into the water, not realizing that as he swam toward the 　　2　　 of the lake, an alligator(鳄鱼)was swimming toward the shore．His mother in the house 　　3　　 of the window saw the two as they got 　　4　　 together．In great fear, she ran toward the water, 　　5　　 to her son as 　　6　　 as she could．Hearing her voice, the little boy became alarmed and 　　7　　 a U-turn(转弯)to swim to his mother．It was too 　　8　　．Just as he reached her, the alligator reached him．The mother 　　9　　 her little boy by the arm just as the alligator caught his 　　10　　．That began an unbelieved tug-of-war(拔河)between the two．The alligator was much 　　11　　 than the mother, but the mother didn't let go．A farmer happened to 　　12　　 by, heard her screams, raced from his truck, took aim and shot the alligator．

　　After weeks and weeks in the hospital, the little boy 　　13　　．His legs were extremely scarred by the 　　14　　 of the animal．And, on his arms, were deep 　　15　　 where his mother's fingernails 　　16　　 into his flesh in her effort to 　　17　　 the son she loved．

　　The newspaper reporter, who 　　18　　 the boy, asked if he would show him his scars．The boy lifted his legs．And then, with obvious 　　19　　, he said to the reporter, " 　　20　　 look at my arms．I have great scars on my arms, too．I have them because my Mom would not let go．"

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阅读理解

　　There Student thieves look out．Students can easily get many research papers off the Internet．A new Web site could help teachers catch copiers．

　　Some students research and write their term papers．Others, however, just copy them off the Internet and turn them in as their work．

　　Two graduate students at the University of California at Berkeley have written a program named the Internet research Watchdog to catch the students who write fake(假的)papers．It compares a student's paper with every other term paper on the Web．A hundred million Web pages on the Internet are searched．The top 20 search engines are used for the search．This service can be found at www．plagiarism．com．They also have a local data base of term papers．

　　Teachers who sign up can send their students' papers to the Web site．Within 24 they know if the student did the work．

　　Every sentence that was a word-for-word match with another sentence either found on the Internet or within our database is coded．

　　A U．C．Berkeley professor told his class he would use the program．Still some students copied papers．All 300 papers went through the program．15 percent of students had cut and pasted large amounts of material from different World Wide Web sites

　　Students that say they didn't copy can defend themselves．They can show the instructors where they got their material．Students at universities try hard to get good grades．Students interviewed welcome the Internet research watchdog because they say it is fair to all．They think copying is wrong．

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阅读理解

　　You’re in a bit of a dilemma standing in front of the produce section of your local supermarket．In one hand, you’re holding a conventionally grown Granny Smith apple．In your other hand, you have one that’s been organically grown．Both apples are firm, shiny and green．Both provide vitamins and fiber, and both are free of fat, sodium and cholesterol．

　　The conventionally grown apple costs less and is a proven family favorite．But the organic apple has a label that says “USDA Organic”．Does that mean it’s better? Safer? More nutritious? Several differences between organic and non-organic foods exist．Become a better informed consumer for your next trip to the supermarket．

　　The word “organic” refers to the way farmers grow and process agricultural products, such as fruits, vegetables, grains, dairy products and meat．Organic farming practices are designed to encourage soil and water conservation and reduce pollution．Farmers who grow organic produce and meat don’t use conventional methods to fertilize, control weeds or prevent livestock disease．

Here are other differences between conventional farming and organic farming：

　　*Organic or not? Check the label．

　　The U．S．Department of Agriculture(USDA)has established an organic certification program that requires all organic foods to meet strict government standards．These standards regulate how such foods are grown, handled and processed．Any farmer or food manufacturer who labels and sells a product as organic must be USDA certified as meeting these standards．Only producers who sell less than ＄5,000 a year in organic foods are exempt(免除)from this certification．

　　If a food bears a USDA Organic label, it means it’s produced and processed according to the USDA standards．The seal is voluntary, but many organic producers use it．

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