The introduction of new varieties of rice and wheat in Asia and Latin America has been（1)_

The introduction of new varieties of rice and wheat in Asia and Latin America has been(1)_____ as the "Green Revolution." So far the new seeds and the(2)_____ technology have not resulted (3)_____ increased agricultural production(4)_____ or reduced malnutrition. The direct, quantitative effects of high-yielding(5)_____ of food grains have been modest. The indirect and quantitative effects, however, have sometimes(6)_____ significant. The new technology has led to(7)_____ in crop pattern and in methods of production. It has accelerated the development of(8)_____ market-orientated, capitalist agriculture. It has encouraged the growth of wage labor, and(9)_____ helped to create or augment a (10)_____ of agricultural laborers. It has increased the power of landowners, and this in(11)_____ has been associated with a greater(12)_____ of classes and intensified conflict. Changes in status and class alignments have been accompanied(13)_____ changes in the distribution of income. Profits and rents have increased absolutely and relatively. The share of wages has declined and in some(14)_____ real wages rates or the number of days worked, or both, have declined. In(15)_____, an old system of agriculture, slowly (16)_____ swiftly is in the(17)_____ of being destroyed by the advance of contemporary technology. The policies that have accompanied the "Green Revolution" in many(18)_____ countries have aggravated the problems these countries(19)______. Supplies of some commodities have increased, but the rate of growth of total agricultural production has shown little(20)_____ to rise. At the same time, inequality has become worse, poverty has increased absolutely.

(1)

A．considered

B．thought

C．known

D．called