正确答案: BCD

既对立又统一的关系 事物普遍联系的根本内容 事物变化发展的动力和源泉

题目：矛盾是

解析：BCD

查看原题 点击获取本科目所有试题

举一反三的答案和解析：

[单选题]主要促使胰腺小导管细胞分泌大量H2O和HC03-的是

促胰液素 ．

[单选题]有关细胞因子TNF的描述，错误的是

引起疼痛

[单选题]Passage ThreeIn an age when waste today means a lack tomorrow, making use of every available resource becomes more and more important. As coal is being used in greater and greater amounts to produce electricity, larger amounts of ash, by-product of coal, are produced. When coal is burned

The coal by-product.

解析：答案为 A。根据题干找到第一段第三、四句，About 10 to 15 percent of the coal by-product is bottom ash which is used like sand on icy city streets and highways and also on highways as paving material 符合题意。

[单选题]假如劳动总供给曲线对实际工资的变化不敏感，那么：（ ）

劳动总供给曲线是完全没有价格弹性的。