WHO用于牙周疾病调查的指数是
A．软垢指数DI
B．社区牙周指数CPI
C．口腔卫生指数OHI
D．菌斑指数PLI
E．牙龈指数GI
参考答案：B
As everyone knows, the South China Sea is _____ part of China, _____ important part of China,
any other country outside Asia doesn't have _____ say in this issue.
[ ]
A. a, an, /
B. /, an, a
C. a, the, the
D. a, an, /
关于要素饮食的概念下列哪项不妥
A．是一种化学精制食物B．只需要经小肠消化C．含有人体需要的全部营养成分D．含的蛋白质为氨基酸E．含的糖类为单糖
