一、. 单项选择 (每小题1分,共20分)
从每小题所给的四个选项中,选出可以填入空白处的最佳答案。
(   )1. Beijing has got       population of more than 13.8 million.
       A. the                     B. a                      C. an                     D. /
(   )2. In hot summer, we should pay attention to protecting ourselves _____ strong sunlight. 
       A. from                  B. for                    C. with                         D. to