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LANGUAGE POINTS

1. quality n. 质量（ 不可数 ） (人的)品质；特性（ 可数 ）

The products of their factory are all of good quality and so the supply fails to meet the demand every year.

　　One quality of this plastic is that it is almost unbreakable .

※quantity 量 a large /small quantity of

large /great quantities of

（以上两词组后加可数名词复数和不可数名词都可以，谓语动词取决于quantity的形式)

　　Quantities of water are in the glass.

　　A large quantity of water is in the glass.

　　Quantities of books are on the desk.

　　A quantity of books is on the desk.

2. mean adj.吝啬的 ， 自私的，卑鄙的

be mean to sb 对某人吝啬，自私，卑鄙

It is mean of sb to do sth 某人做---真卑鄙

be mean with/over/about sth 对---很吝啬

eg. He is mean to everyone.

It is mean of you to tease her.