Câu trả lời:
1. Up to now, we have hardly estimated the destruction that our country suffered during the war.
2. The conservation of forests is very necessary to prevent erosion.
3. Dangerous ecological effects of industry cause a lot of changes in the climate.
4. She is a famous conservationist who is very interested in protecting wild animals from extinction.
5. The mountain gorilla is on the verge of extinction.
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