GPS是全球卫星定位系统的简称,它传递信息依靠的是( )
A:电磁波
B:超声波
C:紫外线
D:次声波
有关基因与酶关系的叙述正确的是( )
In her ____ (判断),it was a wrong thing to give children so much pocket money.
既能发育成叶又能发育成花的芽叫作( )