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(A) predicted
(B) instructed
(C) described
(D) emphasized

(A) predicted    預測
(B) instructed    指示
(C) described     描述
(D) emphasized   強調

Most progress against air-pollution has been cheaper than expected.
大多數空氣污染防治進展的成本都比預期的要低。

Smog controls on automobiles, for example, were predicted to cost thousands of dollars for each vehicle.
例如，汽車煙霧控制預計每輛車要花費數千美元。

Today's new cars emit less than 2 percent as much smog-forming pollution as the cars of 1970, and the cars are still as affordable today as they were then.
今天的新車排放的煙霧污染比 1970 年的汽車少了 2%，而且今天的汽車價格仍然和當時一樣便宜。

Acidrain control has cost about 10 percent of what was expected in 1990, when Congress enacted new rules.
酸雨控製成本約為 1990 年國會頒布新規則時預期成本的 10%。

At that time, opponents said the regulations would cause a "clean-air recession"； instead , the economy boomed.
當時，反對者稱這些規定將導致「清潔空氣衰退」；相反，經濟卻蓬勃發展。

Greenhouse gases, being global, are the biggest air-pollution problem the world ever faced .
全球性的溫室氣體是世界有史以來面臨的最大的空氣污染問題。