11.He was faced with the________ of whether or not to return to his country after he got a PhD in America.(situation, circumstance, environment, dilemma)
答案：dilemma 解析：考查名词辨析。句意：他面临着在美国获得博士学位之后是否回国的两难境地。根据whether or not可知应选dilemma，意为“(进退两难的)窘境，困境”。
12.In recent years, many mainland residents have rushed to Hong Kong to buy baby milk powder due to their ________ about its quality.(anxiety, curiosity, generosity, attention)
答案：anxiety 解析：考查名词辨析。句意：近年来，许多大陆居民奔赴香港购买婴儿奶粉，因为他们担心奶粉的质量。anxiety意为“担心”，符合语境。curiosity意为“好奇”;generosity意为“慷慨”;attention意为“注意”，均与语境不符，故排除。
13.Finding information in today's world is easy. The ________ is how you can tell if the information you get is useful or not.(knowledge, ability, competition, challenge)
答案：challenge 解析：考查名词辨析。句意：当今世界找寻信息很容易，但困难的事是你如何辨别你所获得的信息是否有用。knowledge“知识”;ability“能力”;competition“竞赛”;challenge：“挑战;艰巨任务”。
14.The lead singer was ill and couldn't sing that night, and her ________ didn't perform well, which made the audience disappointed.(attitude, substitute, institute, altitude)
答案：substitute 解析：考查名词辨析。句意：那天晚上主唱歌手生病了，无法演出，替代她的歌手表演得不好，这让观众很失望。attitude态度;substitute代替者;institute学院，研究所;altitude高度，海拔。根据句意可知应选substitute。
15.Mo Yan, a most widelyread writer, takes a complete new ________ to describing China's rural and folk culture.(way, approach, passage, entry)
答案：approach 解析：考查名词辨析。句意：莫言的作品被广泛阅读，他采用了全新的方法来描述中国的乡村民俗文化。an approach to为固定搭配，相当于a way of，意为“……的方法”;passage指人们行走的“通道，走廊”;entry意为“进入;进入权;入口处”。
