The report gave a rough cost of 300 dollars to build a toilet，including labour，and materials.The world could expect a return of up to 34 dollars for every dollar spent on sanitation through improved productivity and reduced poverty and health costs，said Adeel.He said improving sanitation was an economic and humanitarian opportunity of historic proportions.

　　50．The population of India is about________.

　　A．less than 1 billion

　　B．about 1.2 billion

　　C．900 million

　　D．800 million

　　51．From Paragraph 4，we can draw a conclusion that________.

　　A．India is so poor that they can’t afford the basic necessity and quality of a toilet

　　B．a mobile phone is more important than a toilet

　　C．it’s normal in Indian that they can’t attach importance to toilets

　　D．Zafar Adeel wasn’t satisfied with the sanitary situation in India

　　52．Improving sanitation can play an important part in the following EXCEPT________.

　　A．preventing water-borne diseases

　　B．saving lives of young people

　　C．pulling developing countries out of poverty

　　D．improving the quality of mobile phone and getting more information

　　53．According to the last paragraph，if the government put into $10,000 on sanitation，they can get a return of________.

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