在玉米种子中，______是幼小的生命体；玉米种子萌发时，_______发育成根，________发育成茎和叶。
胚 胚根 胚芽
第二节单项选择（每题1分，共15分）
The Sping Festival is_____ traditional holiday, ______ time when all the families get together and have fun.
A．a；／
B．a；a
C．the；a
D．the；The
The moon is shining brightly ______ (透过) the window on her face.
