【单选题】Copying Birds May Save Aircraft Fuel Both Boeing and Airbus have trumped the efficiency of their newest aircraft, the 787 and A350 respectively. Their clever designs and lightweight composites certain...
【简答题】连词成句。 1. park, an, never, I, amusement, been, to, have 2. and, take, Tina, going, the, subway, Linda, to, are 3 . you, start, English, did, when, learning 4. been, long, there, how, have, you 5. have,...