Research has been limited to ________ production profits, rather than ________ that GM foods are safe.A.increasing; make sureB.increasing; making sureC.increase; make sureD.increase; making sure
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B解析be limited to局限于，to 为介词，故接动名词，rather than 后接动词原形，故选A。句意：研究者只局限于生产利润而不是确保转基因食品的安全性。
考点：介词to 及rather than 的用法。
点评：要熟记语法规则：介词to后接名词，代词，或动名词，rather than 后接动词原形，另外prefer to do sth rather than do sth也是常考结构