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课时作业(三十七) [选修8 Unit 2 Cloning] [限时：35分钟] Ⅰ.单项填空 1．I have no idea ________ the journalist could have got his information from. A．that B．why C．which D．where 2．One reason for her preference for city life is ________ she can have easy access to places like shops and restaurants. A．that B．how C．what D．why 3．Along with the letter was his promise ________ he would visit me this coming Christmas. A．which B．that C．what D．whether 4．People take naps at noon in warmer climates, ________ the heat makes work difficult in the early afternoon. A．which B．what C．where D．when 5．[2011·课标全国卷] William found it increasingly difficult to read，for his eyesight was beginning to ________. A．disappear B．fall C．fail D．damage 6．As is well known, everyone is forbidden ________ in buses, regardless of what they are. A．to smoke | 
