He is perfectly _______ to live in the mountain, feeds some lovely chicken and _______ what he likes all day.

A．popular; draws

B．anxious; painted

C．proud; described

D．content; paints

测得某些食物的近似pH如下表：

根据上述数据分析，下列说法中正确的是[ ]

A．牛奶和鸡蛋清均属于碱性物质

B．胃酸过多的人应少食苹果

C．柠檬能使紫色石蕊试液变红

D．西红柿的酸性比苹果的酸性强