Children in the United States eat too much pizza that some researchers now argue the food should join the ranks of sugary drinks and fast food for the harm they do to health．

    In a new study, the researchers found that pizza is a large source of calories, saturated fat(饱和脂肪)and salt in children's diets．Children should not eat more than two slices of pizza for a meal，and should pair that with salad, rather than with another high-calorie food，the researchers concluded．

    “Parents should aim to control pizza consumption(消费), particularly as a snack where it was shown to have a very adverse impact on children, and they should put their pizza dollars toward healthier brands．”Said Lisa Powel, director of the Illinois Prevention Research Center．

    Pizza has become a matter of focus in recent years for researchers who look at the meals children eat, rather than the nutrients within them．Studies have found pizza is among the greatest sources of calories for children．

    “Since pizza remains a common part of children's diet, we need to make 'healthy' pizza．”Powel said．To make pizza healthier, food producers should reduce its saturated fat and salt, and increase its whole grain content,” she said．

    Whether or not pizza is harmful enough to be picked out as an unhealthy food, the study attracts attention to a larger issue with the modern American lifestyle, said Alexis Tindall, who was not involved in the flow research. “Many foods are eaten too frequently and in large sizes,” said Tindall．To solve the problem, people don't have to give up eating pizza, but instead, they can eat smaller and healthier pizza，”she said．

    “Make it at home, instead of ordering it out where you don't have any control over how it's made.” Tindall said. “When we make it at home, we can choose healthier ingredients，increase the vegetables, reduce fat, and put in less cheese．Pizza doesn't have to be just pepperoni(意大利辣香肠)and cheese．”

阅读下列材料，并结合所学知识回答问题：

材料一：中文“民主”一词最早出现于《尚书》。该书提到：“天惟时求民主，乃大降显于成汤。”这里说的是：暴君夏桀残民以逞；不配做民之主，推翻夏桀的成汤才是民主。

材料二：雅典民主政治家伯利克里在一次演讲中说：“我们的制度被称作民主政治”，那是千真万确的，因为政权不足在少数人手中．而是在多数人手里。就法律而言，一切人解决他们私人纠纷方面都是平等的；就人的价值而言，无论任何人以何种方式显露出优于他人担任一些荣耀的公职，那不是因为他们属于特殊的阶级，而是由于他们个人才能。”

―――摘自《希腊伯罗奔尼撒战争史》

阅读下列短文，完成后面小题。
                                                                                         人类未来的食品来源——昆虫
        昆虫也能供人类当食品吃？是的。现在墨西哥国立自治大学生物学学院内，一位女教授胡列塔•拉莫斯•埃洛蚀伊正领导着她的动物专业研究小组，研究着将昆虫当食物的课题呢！
        其实，早在许多年以前，在那些因受地理条件限制，发现农业生产有困难的地区，如非洲和亚洲的一些国家，人们已经把昆虫作为食物了。有的还作为粮食来吃哩！即使在一些发达的国家里，如美国等，专门商店或饭馆、餐厅里也经常出售用昆虫做的罐头或菜肴，较多见的是蚂蚁、蛾蝶、蛾状毛虫，蜜蜂幼虫、蚕蛹、龙舌兰红囊、蜜蜂等。
        至于在墨西哥，人们食昆虫同样是家常便饭的事。据不完全统计，全国有9个州的居民爱食昆虫，所食的昆虫种类多达57种，主要的有蚂蚁、直翅目昆虫、甲虫、蝉，甚至苍蝇、蚊子、臭虫、黄蜂、白虱、蜻蜓、蝴蝶等。
        不过，女教授和她的助手们的研究成果表明，昆虫身上确实含有人类维持生命所必需的大量的各种营养，甚至比一般动物所含的价值还高。以蚂蚁一类昆虫来说，每100克含蛋白质为20．4克。而100克鸡肉和鱼肉所含蛋白质分别是20．2克和18．9克，100克蛋类所含蛋白质更少，仅6．4克。其他像维生素B1和维生素B2等，100克蚁类所含的量也要比100克鱼、肉、家禽等所含的量高得多。因此，女教授认为，人类在缺乏其他粮食作物的情况下，只有昆虫才可用作代用品。换句话说，人类如果有系统地加以利用，那么昆虫定将成为未来的可信赖的食品。