红外线是一种比可见光线长而又比微波波长短的()。
参考答案:电磁波
It was in the garden of his old house _____ he grew up that he dug up a pot of gold. [ ]
A. that
B. where
C. which
D. what
兰科植物以()繁殖方式为主
A.分株繁殖
B.播种
C.扦插
D.组织培养