Compared with the seed-eating in a temperate forest, the one in the rainforest is a valid action.

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Compared with the seed-eating in a temperate forest，the one in the rainforest is a valid action．
与在温带森林中食用树籽相比，在雨林中食用树籽就是一种合理的行为。
由题于中的seed—eating定位到原文画线处。
[C]段提到在橡树林里，动物不可能仅仅食用树籽，因为橡果只在秋天才落下来。丽在热带雨林中，树籽不断从树冠上落下来，因此食用树籽就可以成为～种合理的行为。题干中的valid action对应原文中的legitimate profession，故选[C]。

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Mark Ramirez, a senior executive at AOL, could work in the most comfortable leather chair, if he wanted. No, thanks. He prefers to stand most of the day at a desk raised above stomach level. "I've got my knees bent; I feel totally alive," he said. "It feels more natural to stand."
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Standers give various reasons for taking to their feet: It makes them feel more focused, prevents doze, and makes them feel like a general even if they just push paper. Former defense secretary Donald Rumsfeld works standing up. So does novelist Philip Roth.
But unknown to them, a debate is spreading among some experts and public-health researchers about whether all office workers should be encouraged to stand--to save lives.
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Incidences of varicose veins (静脉曲张) among women will increase. The heart will have to pump more.
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What may be the reason for Mark Ramirez's standing to work most of the day?

A．The desk is raised above his stomach.

B．The chair is uncomfortable.

C．He wants to be close to nature.

D．It can keep him completely alive.

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