class="groupcontent">第 48 題至第 50 題為篇章結構，各題請依文意，從四個選項中選出最合適者，各題答案內容不
While the appeal of a renewable, home-grown alternative to foreign oil has put
ethanol front and center in US energy policy discussions, the fuel still faces
critics who question its feasibility as a replacement for oil and its impact on the
Ethanol is an alcohol-based fuel generally made from the starch or sugars in
crops like corn, barley, sugar cane, and sugar beets. Almost all of the ethanol
produced in the United States comes from corn, while Brazil-the second-largest
producer of ethanol-uses sugar cane. 48
Ethanol use has increased in the past decade. It is now available at
nearly1,200 pumps in the States. 49 President Bush called in January 2007 for
mandatory alternative fuel use to grow to 35 billion gallons by 2017.
However, not all analysts think that ethanol is the answer to America＇s energy
needs, despite increased ethanol use. While proponents stress ethanol＇s benefits
for reducing dependence on fossil fuels, critics say that it takes a significant
amount of “old＂ energy resources to produce it. Moreover, to support ethanol
production, American government provides a 51–cent subsidy to refineries for every
gallon of ethanol blended into gasoline. Critics say that government support has
increased pressure on corn production, while driving up the cost of corn and
diverting an increasing proportion of the corn crop for the fuel.
50 In Mexico, the price of tortillas, traditionally made with corn and a
staple of the Mexican diet, tripled during the latter half of 2006 ,according to a
recent Washington Post article, Another expert also expressed concern that the
demand for sugar cane for ethanol could result in the destruction of the
destruction of the Amazon rainforest.
(A)The money to be made from ethanol is driving farmers to plant more corn
and switch lands from other crops.
(B)Ethanol also can be made from materials such as wood and grasses.
(C)The boom in corn demand helps boost the farm economies in many states.
(D)The ripples of rising corn prices have also spread beyond America＇s