题目内容

生产经营单位是本单位安全生产的责任主体，其主要负责人是第一责任人，但不必负全面责任。()

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符合维生素B2的理化特点的是()。

A. 碱性环境中稳定
B. 酸性环境中不稳定
C. 在紫外线照射下易分解
D. 有亚硫酸盐存在时易分解
E. 有Cu2+、Fe3+存在时易被破坏

21. According to the passage , all monkey troops are equal.
22. People have long been interested in animal behavior.
23. The last sentence of Para. I means that they are only regarded as evidence for the remarkable variety of nature.
24. The second paragraph mainly tells about the superficial aspects of social behavior.
25. The third paragraph mainly tells about what affects the formation of one' s behavior. towards one' s fellows.
26. More and more scientists participating in the study of sociobiology arc convinced that human behavior. arises almost entirely from unique intellectual and emotional capacities.
27. Some scientists believe sociobiology would affect their theories and practices.
28. Sociobiology mainly studies modem human society.
29. Scientists believe that animals have similar behavioral patterns.
30. Darwinian theory plays a key role in the study of animal behavior.according to the passage.

矿山和危险物品的生产、经营、储存单位，从业人员在一百人以下的，可不必配备专职安全生产管理人员。()

城乡居民收入增速超过经济增速，中等收入群体持续扩大。()