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
