单项选择题

It is impossible for parents to shield their children from every danger.

A．protect
B．relieve
C．conserve
D．free
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我们国家要走向现代化，最大的障碍，并不是资源问题，也不是资金问题，更不是技术问题，而是十几亿人口的素质问题。资金可以积累，资源可以更有效的利用，技术可以创造也可以引进，但是几亿人口的素质(quality)是无法引进的，这必须靠我们去提高。
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