1. John Snow wanted to face the challenge and solve this problem.(P2)
【考点】 challenge在此作名词，意为“挑战”，还可作动词，意为“向……挑战”。
【考例】 AIDS control and p revention is a ______ to China as well as the whole w orld.
A. surpr ise B. challenge
C. reaction D. th reat
【点拨】选B。句意为：控制和预防艾滋病对中国乃至全世界都是个挑战。
2. It seemed that the water was to blame. (P2)
【考点】 blame在此作动词，意为“责备；谴责”；be to blame (for sth.) 对（某事）负责。
【点拨】选B。
