What is the main idea of the third paragraph？
An ecosystem is a community that includes animals, plants, and microscopic bacteria.
B. Local ecosystems depend on each other, so human activity should be cautiously planned.
C. In managing the ecology of an area, we should use natural succession to our advantage.
D. People should remember that they are a part of the ecosystems where they live and work.
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According to this author, after a forest fire, the first living things to reappear would be
A. algae
B. insects
C. mosses and ferns
D. forest animals
教师之间的密切配合不直接关系到班级常规管理的效果。()
We can infer that the definition of natural succession the author would support would be______.
A. methods of preventing runoff of water
B. the relationship between the environment and living organisms
C. the effect of living things on the environment
D. how environmental changes change life within an ecosystem
各种网络在物理层互连时要求数据传输率和链路协议都相同。()
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