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     The outbreak of SARS tells us that a sound public health system ________ be built up and strengthened in our country.

         A．should      B．can        C．will           D．may

     A　句意为“SARS的爆发告诉我们，在我国一个健全的公共卫生系统应该被巩固和加强”。should意为“应该”，用来表示义务或职责。

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