问题
单项选择题
Why have the Americans developed space shuttle according to the passage
A．It is a first step to explore outer space.
B．It is a follow-up action of the Apollo moon landings.
C．It is a compromise to the exorbitant human expeditions to the Mars.
D．It is a compensation for the wishful thinking of human landing on the Mars.
答案
参考答案：C
解析：因果关系的判断。根据原文，人类梦想去火星探险，但是“confronted with the cost…presidents…have flinched and resorted to halfway measures like the shuttle”即“面临经费问题，美国总统们畏缩了，不得不做出妥协，先发展航天飞机”。由此可见，发展航天飞机只是人类去火星探险梦想的妥协。只有选项c符合这种判断，因此该项的说法是正确的。 注意：掌握因果关系的表达法，可快速理解原文。文中使用了过去分词短语 (confronted with)的形式来表示因果关系。