题目内容
（请给出正确答案）
[主观题]
Which of the following is true according to the text？A．Many cities plan to buy GM buses.B．
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.
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