种子生长的条件是 ( )
A．水分
B．适当的温度
C．氧气
D．土壤
E．胚胎
参考答案：A,B,C
工业上制备O2的方法是：分离______．原理是：利用N2、O2的______不同，______先被蒸发，余下的是液氧．此过程是______变化．
I just choose a simpler lifestyle, ______where I can ride my bike all over and do not have to make a
great living to survive.[ ]
A. that
B. it
C. one
D. another
