— Waiter, I'd like a hot wing hamburger and corn salad.
— Sorry, sir. They ________ only for lunch and dinner. Why not consider ________ something else?
A:serve; to order
B:served; ordering
C:are served; ordering
D:served; to order
为探究影响浮力大小的因素,小明用量程是0~5N的弹簧测力计做了如图所示的实验.
①蝙蝠; ②青蛙;③丹顶鹤; ④家兔; ⑤鲫鱼; ⑥扬子鳄
在血液中,具有运输氧功能的主要是( )