Thefirstastr的精選

問題詳情：閲讀下面短文，從短文後備題所給的A、B、C、D四個選項中，選出可填入空白處的最佳選項。ThefirstastronautsSincetheearliesttimes,peoplehavelookedupatthestars,themoonandtheplanets.Todaypeopleusemodernmach...