试题题干
WORD FORMATION
Complete each of the following sentences with the proper form of the word in brackets.
Income is one way to keep track of how well Americans are doing, but so is 
that is, how much is spent. (consume)
参考答案
试题解析
此处缺少名词。
应填写与income相对应的名词。收入对应的是消费，所以填consumption。
句意：收入是记录美国人生活水平的一种方法，但消费也有如此作用，也就是说，花了多少钱。