.B细节理解题。根据短文Most sunflower seeds, especially those with eatable seeds, are large enough to handle without the need for seed sorters. 可知这是因为向日葵的种子大，容易收集也容易种植，故选B。

　　考点：考查科教类短文阅读

　　第二节（共5小题；每小题2分，满分10分）

　　根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

　　Today our life and work rarely feel light or pleasant. Instead, the whole experience of being alive begins to melt into one enormous obligation(责任).

　　____

　　We say this to one another with great pride.

　　42

　　We are unavailable to our friends and family, unable to find time for the sunset, to finish off our obligations without time for a single mindful breath. This seems to have become the model of a successful life.

　　Because we do not rest, we lose our way. We lose the relaxation that gives us help.

　　43

　　Poisoned by the belief that good things come only through tireless effort, we never truly rest. This is not the world we dreamed of when we were young. But how did we get so terribly rushed in a world filled with work and responsibility, yet it lacks joy and delight?

　　44

　　Sunday is the time to enjoy and celebrate what is beautiful and good, time to sing songs, give thanks, and walk. It is time to be refreshed as we stop our work, our chores and our important projects.

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