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【单选题】
Organic Food Organic farming was among the fastest growing segments of U.S. agriculture during the 1990s. The value of retail sales of organic food was estimated to be $16 billion in 2004. According to the Food Marketing Institute, more than half of Americans now buy organic food at least once a month. Why is organic food becoming so popular? What is Organic Food? In December 2000, the National Organic Standards Board of the U.S. Department of Agriculture(USDA)established a national standard for the term 'organic'. Organic food, defined by how it cannot be made rather than how it can be made, must be produced without the use of sewer-sludge fertilizers, most synthetic fertilizers and pesticides, genetic engineering(biotechnology), growth hormones, irradiation and antibiotics. A variety of agricultural products can be produced organically, including produce, grains, meat, dairy, eggs, and processed Food products. 'Organic' does not mean 'natural'. There .is no legal definition as to what constitutes a 'natural' food. However, the food industry uses the term 'natural' to indicate that a food has been minimally processed and is preservative-free. Natural foods can include organic foods, but not all natural foods are organic. Only foods labeled 'organic' have been certified as meeting USDA organic standards. Organic Farming The phrase 'organic farming' first appeared in Lord Northbourne's book Look to the Land, published in 1940. But the truth is, organic farming is the oldest form. of agriculture. Be fore the end of World War Ⅱ, farming without the use of petroleum-based chemicals(synthetic fertilizers and pesticides)was the only option for farmers. Technologies developed during the war were found to be useful for agricultural production. For example, the chemical ammonium nitrate, which was used as munitions, became useful as fertilizer, and organophosphates used for nerve gas were later used as insecticide. These days, farmers are switching to organic agriculture once again, but now with an eco logically based, systematic approach that includes long-term planning, detailed record keeping and major investment in equipment and supplies. Although it is still only a small industry, the number of organic farmers is growing by about 12 percent per year and now stands at more than 12,000 nationwide. Organic Farming in the U.S. Today The USDA's Economic Research Service reports that in 1997, the latest year for which data are available, farmers in 49 states used organic production methods and third-party organic certification Services on 1.35 million acres out of a total of 828 million acres of farmland. Approximately two-thirds of the certified U.S. organic farmland was used for crops, and one-third was used as pasture. Large farms, mostly located in the Midwest and West, produced processed tomatoes, organic wine grapes and other high-value crops on a commercial scale, whereas numerous small farms, concentrated in the Northeast, specialized in mixed vegetable production for direct marketing to consumers and restaurants. While organic food can be found throughout the country, California was the leader in production of organic fruits and vegetables in 1997, followed closely by Arizona, Florida, Texas, and Washington in decreasing order of total yield. Farmers and ranchers in 23 states raised a small number of certified organic cows, hogs and sheep. New York, Wisconsin and Minnesota were the top producers of organic dairy cows. Production: Organic vs. Conventional As you can imagine, organic agricultural practices are quite distinct from those of 'conventional' farming. Conventional farmers: apply chemical fertilizers to the soil to grow their crops spray with insecticides to protect crops from pests a
A.
Y
B.
N
C.
NG
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【判断题】中国古典园林基本不受禅宗思想影响。
A.
正确
B.
错误
【单选题】JSP 的全称是 ()
A.
Java Servlet
B.
Java Server Pages
C.
JavaScript
D.
Jscript
【多选题】麻醉家兔时,以下做法正确的是( )。
A.
注射时前1/3的药物剂量要快
B.
后2/3的剂量宜慢
C.
边注射、边注意观察动物有没有达到麻醉指标
D.
当确定已达到麻醉效果时,就可停止给药
E.
如果确定麻醉剂量不够,追加药物的量一般不超过总量的1/3
【单选题】It can be inferred from this passage that the Pugwash Conference and the meeting in Genoa, Italy had come up with similar measures against potential dangers.
A.
Y
B.
N
C.
NG
【单选题】下列不属于坦威斯 MK II防抱死制动系统特点的是:( )
A.
采用了 4 个轮速传感器
B.
对两前轮独立控制,两后轮一同控制
C.
采用了循环式液压调节器
D.
是非整体式三通道控制系统
【简答题】已知 是等差数列,其前 项和为 ; 是等比数列,且 . (1)求数列 与 的通项公式; (2)求数列 的前 项和 .
【单选题】听力原文:Manl:Right,you all know why I've called this meeting.The Megadrome Park has had a serious drop in income over the last 6 months.Frank has circulated a report in which he makes it clear that he fe...
A.
the Park is too old to manage at present.
B.
the Park is suffering a loss in profit in the last quarter.
C.
the Park's profit has been falling in the past 6 months.
【多选题】移动互联网营销借助( )等手机和移动互联网技术。
A.
短信群发
B.
WAP
C.
二维码
D.
手机应用
【简答题】The Secretary’s Role at Meetings The secretary is crucial to the smooth running of a meeting. This involves activities before, during and after meeting. The secretary is typically responsible for comp...
【简答题】(本题满分12分) 已知 是等差数列,其前n项和为 ,已知 求数列 的通项公式
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