题目内容
17．A．By the sea．B．In the park．
C．In the mountains．
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7．
| •The population of China is large．About 20percent of the population（26）略in cities． ．An increasing population is an（27）略problem in many countries． ．Because of too many people，there is too much traffic，（28）略and pollution．Traffic problems（29）略air pollution．There is too much（30）略in the streets． ．Along with the crowd，the smoke，and the transport problems have made a difference to our world．We can look up more facts about this． |