OG16-90题: Prices at the producer level are only 1.3percent higher now than those of a year ago and are going down, even thoughfloods in the Midwest and drought in the South are hurting crops and thereforeraising corn and soybean prices. OG16-104题: Heating-oil prices are expected to behigher this year than last because refiners are paying about $5 a barrelmore for crude oil than they were last year.
为什么上题的比较需要引用those of..., 下题可以直接引用last,同样都是 prices are higher ... than...
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