A. harness B. hatch C. motivate D. gear 参考答案:D 答案解析:[解析] 惯用搭配题。所填的动词能与介词to搭配。从题意来看,我们应该使产品的数量和质量适应公众需求的水平,答案选[D]。gear…to…“调整…使适合…”。[A]harness“统治,支配,管理”;
第13题: [单项选择]Bottom blow valves are installed on auxiliary water-tube boilers to () A. completely drain the boiler in an emergency B. prevent sludge from forming in the drum C. remove floating impurities from the boiler water surface D. remove settled solids from the water drum 参考答案:D