题目内容
（请给出正确答案）
[主观题]
The US has to deal with the problems arising from vehicle use because ______.A．most Americ
The US has to deal with the problems arising from vehicle use because ______.
A．most Americans are reluctant to switch to public transportation systems
B．the present level of oil prices is considered unacceptable
C．other countries will protest its increasing greenhouse emissions
D．it should take a lead in conserving natural resources
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