试题题干
Directions: Read each of the following sentences carefully, and choose A,B,C or D that has the closest meaning to the underlined word or phrase.
A mutation happens to suit a new environment, and the “odd” creature survives because it is better fitted.（）
参考答案
正确答案：
试题解析
alteration 变化。突变发生在适应新环境的情况下，而“奇怪”的生物幸存是因为它适应得更好。