题目

如图所示，用焦距为l0cm的凸透镜，观察一张印有2014年南京青奥会会徽的图片，此时图片到凸透镜的距离应A. 小于10cm B. 大于10cm小于20cmC. 等于20cm D. 大于20cm 答案：【答案】A【解析】试题从图中可以看出，凸透镜成的是正立、放大的虚像，所以此时物距应小于焦距．因为凸透镜的焦距是10cm，所以图片到凸透镜的距离应小于10cm．故选A． 选出适当的短语，并用其正确形式填空。 bring up    account for      cut down    in memory of     hold one's breath    set off      get away with    glare at     at a discount      win back  1. His bad habit of drinking and smoking all day _______ his illness.2. The party wanted to ________ the support it had lost.3. You shouldn't ___________us like that. You deserved the scolding. 4. The father _______ his four children by working as an accountant in those hard years.5. Politeness will never be___________, for people with good manners will leave a goodimpression on others.6. If people don't stop ______trees in the rainforest, many wild animals will have no place to live in.7. The poet wrote a poem ______ the national hero, who lost his life for his country.8. They_____________ on a journey round the Europe since last month. 9. The child should be punished. You shouldn't have him ________ telling lies.10. The tourists _______ when they saw such a splendid building.