(2013·江苏，22)The president of the World Bank says he has a passion for China，________he remembers starting as early as his childhood.

A．where

B．which

C．what

D．when

下列关于糖类的说法中正确的是 (      )

A．糖类都是有甜味的　

B．由碳、氢、氧三种元素组成的物质都是糖类　

C．葡萄糖是单糖，因为其结构简单，且分子中官能团个数少

D．葡萄糖兼有醛类和多元醇的一些性质