It is quite necessary to ______(把我们课堂上学习的东西应用到实践当中).

A．It should have added a third room with orange smell.
B．It should have used chocolate cookies’ smell instead of Windex spray.
C．It didn’t exclude the factor of good smell from clean smell.
D．It didn’t provide the subjects with chocolate cookies.

A．It can raise people’s suspicion.
B．People are not quiet sure of its meaning.
C．It can unlock the mysterious fact neuroscientists do not know.
D．It can be of help to explain the equally mysterious plotless ballet or an abstract painting.