[简答题]
Directions: Read the following passage carefully and then translate
each underlined part into Chinese.
Desertification in the arid United States is flagrant.
Groundwater supplies beneath vast stretches of land are dropping precipitously.
Whole river systems have dried up; others are chocked with sediment washed from
denuded land. 71. Hundreds of thousands of acres of previously irrigated
cropland have been abandoned to wind or weeds. Several million acres of natural
grassland are eroding at unnaturally high rates as a result of cultivation or
overgrazing. All told, about 225 million acres of land are undergoing severe
desertification.
72. Federal subsidies encourage the
exploitation of arid land resources. Low-interest loans for irrigation and other
water delivery systems encourage farmers, industry, and municipalities to mine
groundwater. Federal disaster relief and commodity programs encourage
arid-land farmers to plow up na