正确答案: A

逐级递减

题目：能量沿食物链流动过程中( )

解析：A

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举一反三的答案和解析：

[单选题]Passage FourEqual pay for equal work is a phrase used by the American women who feel that they are looked down upon by the society. They say it is not right for women to be paid less than men for the same work.

women's work shouldn't be harder than men's

解析：48．答案为A  此题为词汇题。“同工同酬”的意义解释。

[单选题]球囊的适宜刺激是( )

垂直方向的直线变速运动

[单选题]Where can you find an area code map of the US?

In the front of the white pages.

解析：

38．答案为C  根据第一段最后一句可知白页的首页可查区号图。

[单选题]第三心音的产生是由于( )

舒张早期血流冲入心室引起心室壁的振动

[单选题]下列关于输血的各项操作中，哪一项是不适宜的( )

向输血器内全血中加入葡萄糖液，有利于血液的输注

[单选题]下列不属于短骨的是 （ ）

指骨