Do you know what chemical ______ are involved when food is digested?
A、courses
B、processes
C、approaches
D、stages
【正确答案】：B
【题目解析】：course 课程；process 过程；approach 接近；stage 阶段，舞台；句意：你知道消化食物时需要用到哪些化学_______吗? B. chemical process 化学过程，句意为：你知道消化食物时涉及哪些化学过程吗?
