如果完全竞争行业中每个企业都处于长期均衡状态，那么整个行业必定处于长期均衡状态。（ ）
【单选题】
下列是不属于造成散射损耗原因的是（）
A.
材料的折射率不均匀
B.
光纤表面畸变
C.
传输过程中光能转换为热能
D.
光纤表面粗糙
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【单选题】
新题型
Zoos which spare no effort to take care of animals should not be subjected to unfair criticism.
To pressure zoos to spend less on their animals would lead to inhumane outcomes for the precious creatures in their care.
While animals in captivity deserve sympathy, zoos play a significant role in starting young people down the path of related sciences.
Zoos save people trips to wilderness areas and thus contribute to wildlife conservation.
For wild animals that cannot be returned to their natural habitats, zoos offer the best alternative.
Zoos should have been closed down as they prioritize money making over animals' wellbeing.
Marris distorts our findings which actually prove that zoos serve as an indispensable link between man and nature.
