试题题干
Word Formation
Complete the following sentence with the proper form of the word in the bracket.
(similar) There is a strong 
between a computer virus and a biological virus.
参考答案
试题解析
此处缺少名词。
a是冠词，strong是形容词，形容词修饰名词，所以变similar为名词similarity。
句意：计算机病毒和生物病毒有很强的相似性。