蜜蜂：蜂蜜
A．彩云：云彩 B．产牛：生产C．上海：海上 D．奶牛：牛奶
参考答案：D
解析： 蜜蜂酿制蜂蜜，奶牛生产牛奶。故选D。
(2013·高考安徽卷)From space，the earth looks blue.This is ________ about seventyone percent of its surface is covered by water.
A．why
B．how
C．because
D．whether
乙炔着火时，用干沙、干粉、四氯化碳灭火器灭火的效果最好。
