题目内容
听力原文： American scientists are developing maps that can identify areas of future flooding. The maps also may help scientists estimate the possibility of extremely dry weather and severe storms.
Tom Jackson of the United States Department of Agriculture prepared the maps after the April flood. He used in- formation provided by satellites in Earth orbit. The maps are produced from dish receivers on the satellites. Each dish receiver measures the wetness of the soil by capturing the natural release of microwave radiation from the soil. The receivers turn rapidly. This provides complete coverage of each area the satellite passes over.
Mr. Jackson and other scientists have tested Aqua's equipment in airplanes and satellites flying over several states. The scientists use the tests to develop ways to change the information gathered into maps.
Mr. Jackson now plans to compare the microwave dish receiver findings with information from tests on Earth's soil, He will use instruments at Agricultural Research Service centers in 4 states. He also will study information pro- vided by forty ground observation centers across the country.
Why are American scientists developing these maps？
查看答案
搜索结果不匹配？点我反馈
更多问题
According to this passage, why the farming activities can affect the animals？
【28】
PART C
Directions: You will hear three dialogues or monologues. Before listening to each one, you will have 5 seconds to read each of the questions which accompany it. While listening, answer each question by choosing A, B, C or D. After listening, you will have 10 seconds to check your answer to each question. You will hear each piece ONLY ONCE.
听力原文： Experts say some farming activities are seriously damaging Earth's environment. Bad farming methods can damage soil, forests and water supplies. They also have caused some plants and animals to disappear.
Two groups now say that bad farming methods are threatening the ability of farmers to produce enough food to feed the world's population in the future. The groups used satellite images, maps and modern equipment to study the effect of agriculture on the environment. The study found that the destruction of soil is widespread. Important organic nutrients are being removed from farmland.
Agriculture uses 70% of the freshwater in the world each year. The study found that many farmers are wasting water supplies. In addition, chemicals designed to protect crops may pollute waterways.
The report also says as much as 30% of the world's forests have been cut down so that the land could be used for agriculture. This has led to a severe loss of wildlife and their environments.
Which is not mentioned in the passage as an aspect that farming activities are damaging？
What is the future work planned to do？
微信支付 
支付宝支付