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阅读短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。

　　Every pet owner loves his pet．There is no argument here．

　　But when we asked our readers whether they would clone their beloved animals, the responses were split almost down the middle．Of the 228 readers who answered it, 108 would clone, 111 would not and nine weighed each side without offering an opinion．

　　Clearly, from readers' response, this is an issue that reaches deeply into both the joy and eventual sadness of owning a pet．It speaks, as well, to people's widely differing expectations over the developing scientific procedure．

　　Most of the respondents who favored the idea strongly believed it would produce at least a close copy of the original; many felt the process would actually return an exact copy．Those on the other side, however, held little hope a clone could never truly recreate a pet, many simply didn't wish to go against the natural law of life and death．

　　Both sides expressed equal love for their animals．More than a few respondents owned“the best dog/cat in the world”．They thought of their pets as their “best friend”,“a member of the family ,”“the light of my life．” They told moving stories of pets' heroism, intelligence and selfless devotion．

　　Little wonders the loss is so disturbing－and the cloning so attractive．“People become very close to their animals, and the loss can be just as hard to bear as when a friend or family member dies ,”says Gary Kowalski, author of Goodbye, Friend：Healing Wisdom for Anyone Who Has Ever Lost a Pet．“For me, cloning feels like an attempt to turn death away…It's understandable．Death is always painful．It's difficult to deal with．It's hard to accept．”

　　But would cloning reduce the blow? This question seemed to be at the heart of this problem．

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阅读些列四篇短文，从每小题后所给的A、B、C、D四个选项中，选出你最佳选项。

　　Vending machines(投币式自动售货机)are found in 16％ of U．S．elementary schools, 52％ of middle schools and 88％ of high schools．About 22％ of students in grades 1 through 12 buy food in vending machines each day-and those purchases added an average of 253 calories to their diets, according to a new study in the September issue of the Journal of School Health．

　　Just to be clear, those were not 253 calories' worth of tofu, yogurt or carrot．The most popular vending machine items included soft drinks, candy, chips, crackers, cookies, cakes and ice cream．On the plus side(好的方面), kids also bought low-fat milk, fruit juice and even fruit, the study found．

　　But the eventual effect on kids' diets was not good．Those who bought from vending machines ate an average of 156 grams of sugar per day, compared with 146 grams for those who abstained(节制)．They also consumed less fiber, iron and vitamin B．

　　One silver lining：Vending machine customers ate 4％ less sodium(钠)than other students-an average of 3, 287 milligrams per day compared with 3, 436 mg for those who didn't buy from vending machines．That's probably because the extra snacks made kids too full to eat as much at mealtimes, when dishes are especially Salty．In any event, kids should eat no more than 1, 200 to 1, 500 mg of sodium each day, according to the Mayo Clinic．Even for adults, the government recommends a daily limit of 2, 300 mg．

　　Overall, vending machines in school appear to be a threat to children's health．The researchers calculated that all that snacking adds up to about14 extra pounds per child per school year．For some students this might be a serious contributor to weight issues．The study was based on data collected from 2, 309 children nationwide for the third School Nutrition Dietary Assessment Study, which was

　　conducted by the U．S．Department of Agriculture's Food and Nutrition Service．

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