单选题
For a solid or liquid fuel to ______, some of the fuel must first be heated to the temperature at which it turns to a gas.
【正确答案】
A
【答案解析】[解析] 动词词义辨析。根据For引导的原因状语,空格中填入的动词应与be heated to意思一致,而且a solid or liquid fuel变成a gas是为了燃烧。选项中,只有ignite(使燃烧)符合要求。故答案为A。