下列有“东方夏威夷”美誉的风景区是（ ）
A．涠洲岛
B．桂林漓江
C．左江花山
D．北海银滩
答案：D
下面对粘土胶体压缩双电层能力最强的离子是（）。
A、SO42-
B、Ca2+
C、Al2+
D、Na+
Most species of this plant thrive in ordinary well-drained garden soil and they are best planted 8 cm deep and 5 cm apart.
A．develop well
B．grow taller
C．mature
D．bear fruit
