Withthepriceofpetrolincreasing,allconsumerswishscientis...

问题详情：

With the price of petrol increasing, all consumers wish scientists to invent new advanced     biofuel as a(n) __________ to gasoline.

A. avenue                 B. application             C. substitute              D. alternative

【回答】

D

知识点：形容词

题型：选择题