阅读理解。 The snow lasted until last Friday. I opened the window this morning and saw the sun  but I felt much colder. 'You'd better go to work on foot , dear,'said my husband,'It is dangerous for you to drive.' I thought him right and agreed. It would take me about forty minutes to go my hospital. There was about an hour left, so I started, with a bag of sandwich for breakfast. In the streets there was thick snow and ice and the traffic was less than before and people walked carefully. Suddenly I saw a car going fast. The driver tried to pass the crossing before the lights turned red. Maybe he didn't see two boys in the middle of the street. His car knocked down(撞倒)one boy and stopped just in front of the police box. People crowded around the boy at once. I rushed out of the gathering crowd (聚集的人群)and was going to look him over. But a man pushed me aside and said,'Step back(向后退),please. I,ve ha d a course in first aid(急救).' I had to stand and watch his ministrations(救助) for a few minutes. Then I said to him,'When you need a doctor, sir, I,m already here.' 1.It's ___ today. A. snowy B. cloudy C. sunny D. windy 2. I left home ___ this morning. A. after breakfast B. before breakfast C. as usual D. too late 3. People walked carefully because ___ . A. it was very cold B. there was much traffic C. they wore warm clothes D. there was much snow and ice in the streets 4. The driver knocked down the boy because ___ . A. he had something important to do B. he was afraid to be late for work C. there was no policeman there D. he drove too fast past the crossing 5. The man thought ___ . A. only he could give the boy first aid B. the hospital was far from there C. he was ready to help the police D. he had a lot of knowledge of medicine