题目

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。 Just 10 years ago, I sat across the desk from a doctor. “Yes,” he said, “there is something wrong with the left, upper lung. You are suffering a severe cancer. You'll have to give up work at once. Later on, we'll see.” Feeling like a man who is in mid­career has suddenly been placed under sentence of death, I left the doctor's office, walked over to the park, and sat down on a chair. I needed to think. In the next 3 days, I cleared up my affairs, then I went home, got into bed, and set my wa “热岛效应”是指城市比周围地区气温高的现象．尤其是夏天，市区与郊区的温度相差几度，乡村的温度又比郊区低一些．我们将近地层气温描在一张图上，可以清晰地看到城市是一个高温区，温度以城市为中心向郊区递减．如果将高温区用红色描述，低温区用蓝色描述，城市就像汪洋大海中的孤岛，气象学中把这种现象称为城市“热岛效应”．“热岛效应”是怎么回事？它是如何形成的？对人们有什么危害？