[单选题]进入左侧道路超车，无法保证与正常行驶前车的横向安全间距时，应怎样做？
A.加速超越
B.并行一段距离后再超越
C.放弃超车
D.谨慎超越

People often speak of fire as though it were a living creature—It grows, dances, needs oxygen, feeds on whatever it can find, and then dies. And when a forest fire rages out of control, threatening human lives and homes, it must be fought like a "wild animal." The fight is often desperate, since firefighters’ best efforts may be dwarfed by the fury of a large fire. But the fire’s own traits can be used against it.
The heated air above a fire rises in a pillar of smoke and burnt gases, pulling fresh air in from the sides to replace it. Firefighters use this fact when they "fight fire with fire." They start a fire well in front of the one which they are fighting. Instead of traveling on in front of the huge fire, the smaller fire is pulled back toward it by the updrafts of the larger blaze. As it travels back to meet the large fire, the smaller backfire burns away the fuel that the forest fire needs to survive.
Even when a backf
A. behind a forest fire
B. ahead of a forest fire
C. on the sides of a forest fire
D. all around a forest fire