阅读短文并做理解题：

　　Can countries, both rich and poor, go on growing without any problems of the world? Or most countries stop their growth? Some thinkers are trying to answer these questions. After making deep studies of the world's resource(资源), they say unlimited (无限制的) growth would be very dangerous. They want to make each country believe that it is necessary to change their ways of production and ask people to have fewer children and use less resource. This, they say, will make every country strong, give people more safety and bring happiness to everyone.

1．The word“production”here means ________ in Chinese.

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2．The word“thinker”in the third sentence means “________”.

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A．people who can't speak

B．people who teaches others

C．people who is good at thinking of problems

D．people who is good at growth