(美国宇航局首次在另一颗行星上驾驶飞机。)"以及后文说明了本次飞行的重要性等,可知"火星无人驾驶直升机历史性首次飞行"符合文意。故选A项。 结果四 题目 NASA has flown an aircraft on another planet for the first time. On Monday, April 19, Ingenuity, a 1.8-kilogram drone (无人机) helicopter, ...
推断SLS的最显著特点是容量大,故选D2.从第二段句子the space shuttle of Saturn 5,the rocket that sent the Apollo missions to the moon可以得知选B3.从第四段Tragically,,however ,a booster flaw (缺陷)caused the space shuttle challenger to crash in 1986可以得知固体火箭助推器不够安全,所以改用液态...