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。