(单选题)

From the last two paragraphs we can infer that.

A.high-tech can completely solve the problem of pollution

B.space technologies should be developed in a large scale

C.we can move to the Mars after the earth has been destroyed

D.we must protect the environment while developing economy

参考答案：D

参考解析：

推理判断题。根据倒数第二段第一句“China needs to develop its economy and invest (投资) in high-tech. Every Chinese wants a strong country. But without blue sky, clean water and safe food, the achievements in the economy will become meaningless”可知，中国需要发展经济和高科技。每个中国人都想要一个强大的国家。但是没有蓝天，干净的水和安全的食物，经济上的成就将变得毫无意义。由此可知，我们在发展经济的同时要注意保护环境。故选D。

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