bywater的精選

問題詳情：Inthefuture,peoplemaytraveltoMars(火星)bywater-poweredspaceship!Today'sspaceshipsarefineforgettingthingsintospace,buttheyarenotsogoodattravellinglongdistances.Thesespaceshipsburnchemicalfuels...

問題詳情：Two-thirdsoftheearth         bywater.   A.arecovered B.iscovered  C.iscovering D.arecovering【回答】B知識點：動詞語態題型：選擇題...