-- Do you think the rain will stop tomorrow?         -

--        . It has rained for four days. It's too wet everywhere.

A．I hope not

B．I don't think so

C．Don't worry

D．I hope so

先吃糖，后吃西瓜，会觉得西瓜不甜。这是因为人的感觉具有

A．对比性
B．感受性
C．适应性
D．发展性
E．选择性