綜合填空

　　Two thousand years ago, only 250 million people lived in the world. In the next 1,700 years, the n___1___ doubled to 500 million. But only 200 years later, the population grew to one billion. Now the population doubles e___2___ forty years.

　　Why did the population grew very s___3___ in the beginning, and why is it growing faster and faster? A long time ago people didn't have e___4___ food. Sometimes their food didn't make them s___5___ People became ill very e___6___ . There were n___7___ hospitals nor doctors, and people often died young.

　　About 2000 years ago, people began to find better w___8___ to farm. They grew more and better food. People didn't get sick as easily as b___9___. Doctors began to learn more about w___10___ made people sick and they learned how to make people well again and so people began to live longer lives. Many more children grew and had their own children. And so the population of the world began to grow faster and faster.
答案：number;every;slowly;enough;strong;easily;neither;ways;before;growing
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