As a result of the fight, Jim was in ________ prison for ________ years.
A:the; five
B:the; fifth
C:/; five
D:/; fifth
小明帮父母收获玉米时,发现有些“玉米棒子”上只有很少的几粒玉米.你认为造成这些玉米缺粒最可能的原因是 ( )
下列实验现象描述正确的是( )
人体发育始于( )