绿色开花植物形成种子和果实一般必须完成两个重要的生理活动是 （ ）
A：自花传粉和异花传粉
B：传粉和受精
C：开花和受精
D：自然传粉和人工辅助授粉
用方框中所给单词的适当形式填空，使短文通顺、正确、连贯（每个单词限用一次）。
hair, never, old, newspaper, play, but, can't, get, glasses, build
My grandfather is seventy years old, ____ he is still very healthy. He is tall and of medium ____ . He has short straight white ____ He likes reading. Every morning he ____ up very early and then reads morning ____ . When he reads, he always wears ____ . He also likes ____ chess, too. He always plays chess with his ____ friends. He ____ plays chess with me. Why? Because I ____ play chess.
下列说法正确的是（ ）
