3.The expression “churn out”(Line 4， Paragraph 5) most probably means ______.

[A]increase

[B]destroy

[C]reduce

[D]produce

4.Why buses are critical to realizing the hybrid dream of higher efficiency?

[A]Buses are a major source of pollution.

[B]A single bus saves much more gas than a single car.

[C]Buses carry more passengers.

[D]New buses produce less harmful material.

5.Which of the following is true according to the text?

[A]Many cities plan to buy GM buses.

[B]GM buses have the incomparable advantages over other buses.

[C]There is severe competition in the field of hybrid vehicles.

[D]The best way to keep the city clean is to buy hybrid buses.

答案：CADBC

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