抗体抗原反应体系中如抗原量过多将产生（） A.免疫复合增多 B.前带反应 C 发布时间：2017-05-20 09:03 │ 来源：www.tikuol.com 题型：多项选择题 问题： 抗体抗原反应体系中如抗原量过多将产生（）A.免疫复合增多 B.前带反应 C.后带反应 D.假阳性 E.假阴性
题型：多项选择题 阅读理解。 You're in a bit of a dilemma standing in front of the produce section of your local supermarket. In onehand, you're holding a conventionally grown Granny Smith apple. In your other hand, you have one that's been organically grown. Both apples are firm, shiny and green. Both provide vitamins and fiber, and both are free of fat, sodium and cholesterol. The conventionally grown apple costs less and is a proven family favorite. But the organic apple has alabel that says "USDA Organic". Does that mean it's better? Safer? More nutritious? Several differences between organic and non-organic foods exist. Become a better informed consumer for your next trip to the supermarket. The word "organic" refers to the way farmers grow and process agricultural products, such as fruits, vegetables, grains, dairy products and meat. Organic farming practices are designed to encourage soil and water conservation and reduce pollution. Farmers who grow organic produce and meat don't use conventionalmethods to fertilize, control weeds or prevent livestock disease. Here are other differences between conventional farming and organic farming: Conventional farmersOrganic farmersApply chemical fertilizers to promote plantgrowth.Apply natural fertilizers to feed soil and plants.Apply insecticides to reduce pests and disease.Use beneficial insects and birds to reduce pests and disease.Give animals antibiotics (抗生素), growthhormones(激素) and medications to prevent disease and promote growth, housing.Give animals organic food and allow them access to the outdoors. Use preventive measures-such as abalanced diet and clean housing－to helpminimize disease. * Organic or not? Check the label. The U.S. Department of Agriculture (USDA) has established an organic certification program that requiresall organic foods to meet strict government standards. These standards regulate how such foods are grown,handled and processed. Any farmer or food manufacturer who labels and sells a product as organic must be USDA certified as meeting these standards. Only producers who sell less than $5,000 a year in organic foodsare exempt (免除) from this certification. If a food bears a USDA Organic label, it means it's produced and processed according to the USDA standards. The seal is voluntary, but many organic producers use it. 1. The main purpose of the passage is ______. A. to promote the sales of organic food B. to inform people organic food is better for their healthC. to persuade people to become informed consumers D. to compare conventional and organic foods2. According to the passage, the conventionally grown apple ______. A. costs less but tastes worse than an organic one B. doesn't look the same as an organic oneC. has proven itself acceptable by the family D. contains more fat, sodium and cholesterol 3. Which of the following methods belongs to organic farming? A. Using chemicals to kill insects and prevent disease. B. Using rotted plants as fertilizer to promote plant growth. C. Using growth hormones to speed up animals' growth. D. Using insecticides to reduce insects and disease. 4. From the passage we know the organic certification program _______.A. is not meant for all producers of produceB. makes it compulsory to attach a USDA Organic labelC. sets restrictions on the sales of organic produceD. requires all foods to satisfy the strict government standards 查看答案
题型：多项选择题 下列属于我国完善生态文明建设体系的基本措施的是（）。A.建立责任追究制度B.划定生态保护红线C.改革生态环境保护管理体制D.实行资源有偿使用制度和生态补偿制度E.健全自然资源资产产权制度和用途管制制度 查看答案