Units 11~12 Scientific achievements Fact and fantasy Ⅰ.单项填空1.The President is now on a visit to Russia, ________ at expanding relations between the two countries.A.aims B.to aiming C.being aimed D.aimed解析:be aimed at doing sth.是习语,此处因为是作伴随状语,故用过去分词形式。答案:D2 . This experiment turned out to be ________ failure, but, as we know, success often comes after ________failure. A.a;a B./;/ C.a;/ D./;a解析:failure 指“失败的人或事”时,是可数名词;泛指失败时是不可数名词。答案:C3.To my delight, I found the new flat ________ in pleasant surroundings.A.located B.locating C.to locate D.being located解析:be located in“坐落在”是固定用法,此处用过去分词作宾语补足语。答案:A4.These doctors are busy day and night, ________ a cure for AIDS.A.bringing on B.pulling on C.taking on D.working on解析:work on“从事于”,此处意为“在研究一种治疗艾滋病的方法”。答案:D5.Now there is just one point ________ I wish you to make quite clear.A.where B.which C.whether D.when解析:point 后是一个定语从句,且 point 在从句中作 make 的宾语,故引导词要用which。答案:B6.Whenever you are in trouble, don’t hesitate ________ me for help.A.asking B.to ask C.in ask D.to asking解析:hesitate to do sth.或 hesitate about doing sth.是固定句式。答案:B7.This problem is not so difficult as we expected.It is believed ________ in a few days.A.settling B.being settled C.to be settled D.to have settled解析:be believed to 是固定句式,此处 it 指代 the problem,与 settle 是被动关系,故用 to be settled。答案:C8 . The moment she came back from work, she ________ to clean the kitchen thoroughly.A.set about B.set out C.set off D.set up解析:set out to do sth.或 set about doing sth.意为“着手或开始做某事”。答案:B9.After twenty years away...