题目内容

下列施工质量控制点中，从施工方法与关键操作的角度进行重点控制的对象是（）。

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Scientists have been working hard to warn people________

"some" in the last sentence of the first paragraph refers to

Another good title for this passage would be

A．servicesB．kitchensC．hygiene D．foods

A. services
B. kitchens
C. hygiene
D. foods