在一个池塘里，鲫鱼能吃水草，又能吃螺蛳等小生物，草鱼吃水草，乌鱼会吃鲫鱼、草鱼苗．下面能反应此池塘中的食物链的是（　　）

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      A glass a day keeps obesity at bay. Wine has always been thought to cause weight gain because of its high sugar content, but new research suggests a glass a day could form part of a diet. Looking at past studies they found that, while heavy drinkers do put on weight, those who drink in moderation can actually lose weight.

    A scientist for the research team at Navarro University in Spain says, “Proper drinking may be more likely to protect against, rather than promote, weight gain.” An official organization reviewed the findings and agreed with most of the conclusions, particularly that present data do not clearly show if proper drinking increases weight.

    Boston University's Dr. Harvey Finkel found that the reasons relating alcohol (酒精) to changes in body weight are not properly understood. His team pointed out the strong protective effects (效果) of proper drinking on the risk of getting conditions like diabetes (糖尿病), which relate to increasing obesity. Some studies suggest that even very fat people may be at lower risk of diabetes if they are moderate drinkers.

    The group says alcohol provides energy that is quickly absorbed into the body and is not stored in fat, and that this process could explain the differences in its effects from those of other foods. They agree that future research should be directed towards assessing the roles of different types of alcoholic drinks, taking drinking patterns into consideration.

    For now there is little evidence that drinking small to moderate amounts of alcohol on a regular basis increases one's risk of becoming too fat. What's more, a study three years ago suggested that a chemical found in grapes and red wine, destroys fat cells.