完形填空。阅读下面的短文，掌握其大意，然后从36-45各题 所给的四个选项中选出最佳答案
Each spring brings a new blossom of wildflowers in the ditches along the highway I travel daily to work.
There is one _1_ blue flower that has always caught my eye. I’ve_2_ that it blooms only in the _3_ hours. The afternoon sun is too _4_ for it. Every day for approximately two weeks, I see those beautiful flowers.
