民间吉他艺人Lela Violao(1)
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科学60秒: 披上"黑色外套"的地外植物
Most plants capture sunlight. And the results are usually green. Because in photosynthesis, plant chlorophyll uses of blue and our sun’s abundant red, and reflects green. But what if—as many ...
科学60秒:焦虑成疾不要紧,奋笔疾书帮大忙 Writing Exercise-
Performance anxiety can be ____1____. Entertainers who suffer from it come up with creative defenses. Bono has his purple shades. The indie rock singer Cat Power faces away from the audience. Oth...
价格的定义
价格的定义The Definition of "Price" Prices determine how resources are to be used. They are also the means by which products and services that are in limited supply are rationed ...
禁烟令带来心脏病的低发率 (1)
Pueblo Colorado Janet Collins More than 20 of the 50 American states ban smoking in public places. Many other states have partial bans. And many local governments have their own restrictions. ...