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Cevap:

EXERCISE 21

many species are in danger because people are hunting wild animals

Deforestation cause global warming because trees are producing oxygen

we should use public transportation because cars produce exhaust fume

nuclear waste has bad effects on life because it causes genetic problems

EXERCISE 22

1-T

2-T

3-F

4-F

5-T

6-F

7-F

8-T