阅读短文，选出最佳答案并填入题前括号里。

      Mike is 10. He is from America. He usually goes to school by bus. He is a baseball player. After school, he

usually plays baseball. 

      His father is a worker (工人). He goes to work by bus, too. Sometimes he goes by bike.

      Mike and his father go to the park every weekend.

1. Mike is ___________.[ ]

A. 10

B. 11

C. 13

2. Mike is an ___________ boy.[ ]

A. Chinese

B. English

C. American

3. Mike often plays ___________.[ ]

A. ping-pong

B. baseball

C. football

4. Mike's father works in a ___________.[ ]

A. school

B. farm

C. factory (工厂)

5. They go to the ___________ every weekend.[ ]

A. zoo

B. park

C. school

在挖掘机的运行过程中，若发现制动系统制动太慢，可能导致的原因不包括下列哪一项（）.

A.系统油压过低

B.系统油位太低

C.制动管路损坏

D.系统温度过高