（二） From 1950 to 1980, the so-called “Green Revolution” 21 the world. World food production doubled with the introduction of a new approach to agriculture. However, the “Green Revolution” methods no longer 22 to be successful. Though the population continues to grow, food production has 23 to keep up with it. One of the reasons lies in the expense of the new farming methods. In order to get maximum production, farmers must use large amounts of expensive chemical fertilizers. The also need to use expensive chemical 24 since the new grains are more easily damaged by insects. Expensive watering systems are also necessary for these grains, especially in drier areas. Many farmers cannot 25 to buy all the chemicals and equipment.
【題組】21. (A) sweeps
(B) swept
(C) swears
(D) swore
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