This washing machine is environmentally friendly because it uses _________ water and electricity than ________ models.
A.less; olderB.less; elderC.fewer; olderD.fewer; elder在线课程A
句意：因为比旧机型节水、耗电量小，所以这台洗衣机是环保的。water和electricity为不可数名词，应由less修饰，故排除C和D。B项为干扰项，注意elder的用法：When comparing the ages of people, especially members of the same family, you can use both“older”and“elder”but never say“elder than”.如：my older/elder sister; the older/elder of their two children; My brother is older than me.