However, pollution and other serious problems have also resulted from human progress. As concerned citizens, it is up to us to learn from past mistakes and to help maintain and improve our environment.

　　1 Early tribes didn’t have much effect on animal population because_____

　　A .they kept animals for themselves

　　B they ate only vegetables

　　C they loved animals

　　D they killed only enough for food

　　2 The main purpose for small clans to join together was_____

　　A to hurt animals

　　B to seek safety

　　C to share caves

　　D to protect environment

　　3 According to the passage ,we can learn that_____

　　A early people moved to new places looking for new sources of food

　　B modern civilization began when people started to live together in big groups

　　C modern advancements are always good for the environment

　　D people began to exchange goods because they didn’t have enough money

　　4 It can be concluded from the passage that_____

　　A human progress has brought civilization to the society

　　B civilization has improved traditional forms of work

　　C early people understood environmental protection

　　D our environment has been affected by human progress

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