2. 汽車在20世紀(jì)30年代跑得很慢，但它們的確比20世紀(jì)20年代的車跑得快。

Cars moved very slowly in the 1930s,but they        faster than in the 1920s,        (do表強(qiáng)調(diào))

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   D. They use wireless technology to improve their products.

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