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裁剪原理的基本原理是通过删减系统中存在问题的元素实现系统的改进。（ ）

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In 2008, the United States Department of Agriculture (USDA) wanted to know if all the school lunches served to students were healthy. The answer was a big, fat NO!
The USDA found that most American schools served lunches with too much fat and salt. They also found that most of the fruits and vegetables in the lunches came from cans(罐头). Canned fruits and vegetables are not as good as fresh ones.
The USDA gives schools food and money to make lunches. But schools make up their own menus. Some make healthy lunches. Most do not. Now the USDA wants all schools to serve more healthy lunches. They want schools to follow the USDA's guidelines for balanced (均衡) meals.
Mike Sanders, in charge of the USDA in 2008, said the USDA should teach school workers how to make healthier lunches. "A good school lunch is just as important as a good textbook," Sanders said. He said that children also need to learn about healthy foods.
The USDA is working off a new program--Fresh Start. It will give schools more fresh fruits and vegetables. Fresh Start will also help schools change their lunches to make them healthier.
To find the best way to change lunches, the USI)A held meetings with parents, school leaders,doctors, and cooks.
Children already eat healthy lunches at Chief Joseph School in North Saratoga, Oregon.They have whole -wheat bread with low-fat cheese, and low-fat milk.
What is the goal of the Fresh Start program?
A.Employinggoodcooksforschools
B.Sellingfreshfruitsandvegetables
C.Findingabetterwaytotalkwithparents
D.Helpingimprovetheschoollunches
单项选择题
在公司上班时，电话铃声响了，你正在吃东西，你觉得最好的做法是（     ）
A、请其他人代接电话，告诉对方自己不在。
B、赶快咽下东西接电话。
C、边吃边接电话，小心点。
D、别人代接，告诉对方不方便，等会儿回过去
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当热水供应的管径小于及等于20mm时，其水流速度为( )m/s。
A.1～1.2
B.0.6-0.8
C.0.8-1.0
D.≯2.0
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