一、从方框中选择适当的单词并用其正确形式填空。
develop good control provide on result
difficulty as lonely important
The population of China is over 1. 3 billion now. The large population has made many bad 1 . For example,the environment is becoming worse and worse. So it’s very 2 to control the growth of the population. In China almost every family has only one child. In this way-China’s One Child Policy,the government 3 the growth of the population.
