农业生产上的种子包括由胚珠发育的籽粒、()、由子房发育的果实三类。
参考答案:无性繁殖器官
The mayor's speech at the conference triggered much enthusiasm and confidence among most of the citizens.
A.arisen
B.happened
C.caused
D.aroused
对于水银温度计,要读()点温度。
A.凸面最低值
B.凹面最低值
C.凹面最高值
D.凸面最高值