正确答案: D

不同使用价值的商品中都凝结了一般人类劳动

题目：两种不同的商品可以按一定比例互相交换的原因在于

解析：D

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举一反三的答案和解析：

[单选题]中国古代哲学家荀子说：“心不使焉，则白黑在前而目不见，雷鼓在侧而耳不闻。”这段话表明人的意识具有

能动性

解析：[答案] B

[单选题]中国现存最早的官修农书是

《农桑辑要》D．《农桑衣食撮要》

[单选题]高等植物光系统Ⅱ的作用中心色素分子是

P680

[单选题]在以下肺炎中，整个病理过程中没有肺泡壁和其他结构损伤的是

肺炎球菌肺炎

[单选题]链球菌感染后肾小球肾炎C3恢复正常的时间

8周内

[单选题]Passage FiveHelen Keller was born a healthy normal child in Alabama in 1880. However, an illness with a high fever struck her when she was still a child. She became deaf, blind, and unable to speak. For little Helen, the world was suddenly a dark and frightening place. She was wild and stubborn. everal years later a miracle came into Helen's life when Anne Sullivan, a strong and loving person, became Helen's teacher. Miss Sullivan's teaching changed the child into a responsible human being. Through her help Helen Keller learned to communicate with those around her, and as she grew older, others benefited from her unique insights and courage. Miss Keller died in 1968, but her spirit lives on. It lives on in her articles and books and in the stories of people who were fortunate enough to meet her during her lifetime.

Because she'd had a very high fever.

解析：

答案为 C。根据题干找到第二句，However，an illness with a high fever struck her 作出该项选择。