企源知识库

Experiments have to be made under carefully _____ conditions.
A、treated
B、supplied
C、related
D、controlled
【正确答案】：D
【题目解析】：treated治疗的，已处理过的 ；supplied提供的 ；related相关的；controlled控制的句意：实验必须在严格控制的条件下进行。