填空题

LAND USE A problem related to the competition for land use is whether crops should be used to produce food or fuel. (1) ______ areas will be examined in this re- (1)______ sped. Firstly, the problem should be viewed in its (2) ______ perspective. When oil prices rose sharply (2)______ in the 1970s, countries had to look for alternatives to solve the resulting crisis. In developing countries, one of the possible answers to it is to produce alcohol from (3) ______ material (3)______ This has led to a lot of research in this area particularly in the use of (4) ______. The use of this material (4)______ resulted from two economic reasons: a (5) ______ in its (5)______ price and low (6)______ costs. (6)______ There are other starchy plants that can be used to produce alcohol, like the sweet (7)______or the (7)______ cassava plant in tropical regions, and (8) ______ and (8)______ sugar beet in non-tropical regions. The problem with these plants is that they are also the people’s staple food in many poor countries. Therefore, farmers there are faced with a choice: crops for food or for fuel. And farmers naturally go for what is more (9)______. As a result, the (9)______ problems involved are economic in nature, rather than technological. This is my second area under consideration. Finally, there have already been practical applications of using alcohol for fuel. Basically, they come in two forms of use: pure alcohol as is the case in (10)______, and a combination of alcohol and (10)______ gasoline known as gasohol in Germany.