There is no ______ evidence that people can control their dreams

There is no ______ evidence that people can control their dreams, at least in experimental situations in a lab.
A、attraction
B、appointment
C、access
D、solid
【正确答案】：D
【题目解析】：D没有确凿的证据表明人们可以控制他们的梦境，至少在实验室的实验条件下是这样的。solid adj.结实的;实心的;固体的;可靠的;纯质的;连续的 n.固体solid foundation 稳固的基础;a solid mass of matter 一连串众多的时间