种子萌发的自身条件是[ ]
A．适宜的温度
B．充足的氧气
C．充足的水分
D．完整具生命力的胚
答案：D
It rained heavily this morning, but _______ of my classmates were away from school.
A．neither
B．none
C．all
D．both
A．一定不带电
B．一定带负电
C．一定带正电
D．带电或不带电均有可能
