题目

Mr. Green works in an office. One day, when he has lunch, a friend comes to see him. They are happy and talk much. And about forty minutes later he has a look at the clock. It’s time to go to office. He says goodbye to his friend and leaves. It’s raining hard and streets are wet. He hits a car in the street. A man looks out and says loudly, “What are you doing? Do you want to kill me?” “I’m sorry, sir, ” says Mr. Green, “I  don’t see the lights turn red.” Then he brings out a bottle of wine and gives it to the man. “It’s cold today, sir, ” says Mr. Green. “Please d下列各组微粒中，在一定条件下均可以作氧化剂的是(　　)A. Fe、H2O、CO2 B. Fe3＋、MnO4—、NO3—C. Cl2、HClO、Mg D. ClO－、Cl－、Ag＋