问题
选择题
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．assumption
B．arrangement
C．assistance
D．appointment
答案
A
题目分析：考查名词。Assumption假定；arrangement安排 ；assitance帮助；appointment委派；句意：假设火星有生命存在的话，一些人说火星应该被保护起来做为一个保护区，在这个地方做我们所能做的来避免污染。根据上文提到Mars should be protected as a wildlife reserve火星应该被保护，假定他有生命存在，所以选A项。
考点 : 考查名词