Findinginformationintoday’sworldiseasy.The 

问题详情：

Finding information in today’s world is easy. The  _______ is how you can tell whether the information you get is useful or not.

A. knowledge                  B. ability                       C. competition             D. challenge

【回答】

D

8-12介词和介词短语

知识点：单词

题型：选择题