【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,...
【简答题】用正确的单词补全对话 Tina: I have never been late for school. But yesterday morning. . . John: What 1 ? Tina: Well, first of all I 2 . John: Did you have an alarm clock? Tina: Yes, but it didn't 3 _ By the time...