阅读理解。

      Mr. Smith is an American man. He teaches us English. He is a very good teacher and we all like him. He

likes us, too.

      Mr. Smith has two children — Tom and Mary. Tom is seven and his sister, Mary, is four. Tom goes to

school, but Mary doesn't. Mr. Smith likes wearing (穿) a T-shirt and jeans (牛仔裤). Soccer is his favorite

sport. After school we often have a baseball match. Sometimes Mr. Smith watches and joins us. He plays

baseball just for fun.

1. We like Mr. Smith because (因为) _______. [ ]

A. he is an American man

B. he teaches English

C. he is a good English teacher

2. How many sons does Mr. Smith have? [ ]

A. Only one.

B. Two.

C. Three.

3. Mary doesn't go to school because ______. [ ]

A. she is Tom's sister

B. she is only four.

C. she doesn't like school.

4. ______ is Mr. Smith's favorite sport. [ ]

A. Baseball

B. Soccer

C. Volleyball

5. The story (故事) is about ______. [ ]

A. Mr. Smith

B. Mr Smith's children

C. Mr Smith's sports

下列有关金属的说法正确的是

A．铝有很好的抗腐蚀性

B．铜的硬度大于锌铜合金

C．生铁和钢都是纯净物

D．导电性最好的金属是铜