【单选题】-I'm worn out, ________, the bike doesn't work well, so I can't go farther. -Then, we'd better have a rest here. [ ]
【单选题】The door______. We'd better have it repaired.
【单选题】以下符合运动镜头编辑点的组接原则的是( )。
【判断题】含有手性C原子的分子一定具有手性,没有手性C原子的分子一定不具有手性。
【判断题】含有手性 C 原子的分子一定具有手性,没有手性 C 原子的分子一定不具有手性。
【单选题】We'd better have our meals______.
A.
at the same time each day
C.
when the meal is still hot
D.
when every one of the family is home
【判断题】我国是裸子植物种类最多、资源最丰富的国家。 [ ]