阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该选项的标号涂黑。
A
Suddenly all the lights on that crowded underground train went out. Then it stopped in that dark tunnel(隧道).
We waited. We expected the lights to come on again soon. But nothing happened. Then I began to smell something. Yes, I could smell smoke. So I asked myself, “Is this train on fire?” People around me then began to cry out in fear. “The train is on fire!” they cried.
Then the woman standing next to me suddenly fell on the floor. I realized she was overcome by the smoke.
