第13题: [单项选择]Mary found _______extremely difficult to pass the examination. A. it B. this C. that D. what 参考答案:A 答案解析:本题的考点为主谓宾补结构。在主谓宾补结构中,如果宾语为动词不定式形式的话,应该用it作为形式宾语,把真正的宾语动词不定式短语放置于句子最后,故本题正确答案为A。该句意为:玛丽发现考试很难通过。
第15题: [单项选择]People living in retirement villages near colleges are allowed to ______. A. cooperate with other retirees to carry, out researches B. work on a research topic by their own C. organize various activities on campus D. have classes with college students 参考答案:D 答案解析:[定位] 根据retirement villages定位到原文第三段第四、五句。[解析] 这些社区的居民有权参加学校的多种活动,其中D)与文中的attend classes同义。[避错指导] 这些活动