马尾松、柑橘、茶和竹等属酸性土植物，宜于生长的土壤pH值是 ( )
A．5.0～6.5
B．6.5～7.5
C．7.5～8.5
D．＞8.5
参考答案：A
Suddenly the idea came to me _______ I might turn to my teacher for help.
A．what
B．that
C．which
D．whom
信息、信息资源包括那些类型？
