A. on the ground of B. on behalf of

　　C. on average

　　D. on the basis of

　　【解析】选D。句意: 这本书是在仔细观察与细致研究的基础上撰写的。on the ground of因为, 由于; on behalf of代表; on average平均; on the basis of“在……基础上”, 符合题意。

　　. 完形填空

　　The world would be a better place if we all had children’s eyes. This is not because children’s eyes are too sharp to allow any blot(污点, 瑕疵)to pass without being　1　, but because adults have too many conflicting concerns to keep their eyes open to all wrongdoings.

　　Not long before, an examination, intended to　2　some police officers to higher positions, was held in Gansu province. Someone　3　with a good idea that 18 primary pupils could be invited to act as invigilators(监考人). At that age, students would do as they are told and act fearlessly. 　4　, they caught 25 officers cheating on the spot, which has caused a stir(轰动, 搅动)and　5　the question of whether adult invigilators would　6　their duties as well.

　　The implication of this event goes　7　its impact on the work style of local police officers and the examinations. Most people said what these children have done points to the sad fact of　8　being less trustworthy. If adults acted as invigilators, they would quite　9　turn a blind eye to cheating.

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