英语生物环境问题1.In modern agriculture, __________. A. high product

英语生物环境问题
1.In modern agriculture, __________.
A. high production is maximized at the expense of biodiversity
B. water is kept free of pesticide contamination by extensive buffer zones
C. the number of different varieties of fruits and vegetables at the supermarket has grown tremendously, with thousands of new choices available
D. crop rotation and "no-till" farming practices have eliminated erosion problems
2.Which of the following statements best characterizes the biodiversity on Earth?
A. Habitat destruction, pollution, and overexploitation of natural resources lead to loss of biodiversity.
B. Biodiversity refers to the richness of topsoil as well as the purity of water and air resources.
C. Of the estimated 100 million species on Earth, scientists have so far only classified 10 million.
D. As a result of farming, the global extinction rate is estimated to be 5 times lower now than at any time during the last 1,000 years
3.Which of the following encourages sustainable development?
A. government subsidies that decrease the price of grain to beef producers
B. importing wood from other countries with larger forests
C. providing financial help to a small business in a developing country in a relative's name as an alternative holiday gift
D. increased offshore oil exploration and drilling