物质的物理属性包括：状态、硬度和______、______等（写出两个就行）．现有以下几种物品：橡皮、纯净水、钢直尺、水银、塑料三角板、玻璃板、食盐水，试把它们分成两类：

一类包括______，其特征为______；

另一类包括______，其特征为______．

“ ____________ you’ve made! But you should still work harder,” the teacher said to the boy.

A．What great progress

B．How a big mistake

C．What a big mistake

D．How great progress