Some people say that Mars should be protected as a wildlife reserve where we do everything possible to avoid pollution, on the _______ that life could exist on it.
A．a(chǎn)ssumptionB．a(chǎn)rrangementC．a(chǎn)ssistanceD．a(chǎn)ppointment
A               
             
試題分析：考查名詞。Assumption假定；arrangement安排 ；assitance幫助；appointment委派；句意：假設火星有生命存在的話，一些人說火星應該被保護起來做為一個保護區(qū)，在這個地方做我們所能做的來避免污染。根據(jù)上文提到Mars should be protected as a wildlife reserve火星應該被保護，假定他有生命存在，所以選A項。         
考點 : 考查名詞
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