问题补充:
Chemicals in the body our food into useful substance.
A. mix up
B. deal with
C. bring in
D. break down
答案:
A. mix up
B. deal with
C. bring in
(答案→)D. break down
解析:短语辨析。mix up混淆; deal with处理;bring in引进,生产; break down分解,失败。句意:我们体内的化学物质把我们的食物分解有用的物质。故选D。