注册结构工程师的注册有效期为( )年,有效期届满需要继续注册的,应当在期满前( )日内办理注册手续。
A.1;30
B.2;30
C.3;45
D.3.5;45
参考答案:B
—Where did you go last night?
-I _______to go to Lily’s birthday party.
A.have been asked
B.have asked
C.asked
D.was asked
如图是花的结构图,据图填空.
(1)你认为图中所示的花朵能不能进行自花传粉?答:______.
(2)花粉是在[______]______里产生,在[______]______上萌发的.
(3)受精后,发育成果实的是[______]______,发育成种子的是[______]______.
(4)一朵花的主要结构包括[______].