单选题
The reason why colonists will probably live longer is that ________.
A、
their hearts will suffer less strain than on the earth
B、
they live in a less crowded and less polluted world
C、
the days and nights on Venus are much longer than on the earth
D、
the life on Venus will be more comfortable than on the earth
【正确答案】
A
【答案解析】
[解析]该题的答案在最后一段第四句可以找到。第四句为：The colonists will live longer because their hearts will suffer less strain than on the earth．即“拓殖者”活得长的原因是其心脏受到的压力小，这样可以同时排除B、C、D。
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