柽柳有十分发达的根系和很小的鳞片状叶，与此有关的主要生态因素是 ( )
A．温度B．水分C．阳光D．土壤理化性质
参考答案：B
下列各电场中，A、B两点电场强度相同的是（ ）
A．
B．
C．
D．
One evening when it was SO warm，I stayed awake on purpose until half past eleven in order to have a good look at the moon by myself．
