在距地面1米的柳树主干上刻一标记，十年后（假定地面无升降），则所刻标记距地面距离是[ ]
A．大于1米
B．小于1米
C．等于1米
D．无法预测
答案：C
阅读理解，选择正确答案。
Mary is an English girl. She is twelve years old. She is in Class Two, Grade Five. She likes red. She goes to
school by bus. Her father is a businessman. He is forty. He works in an office building and drives to work.
Mary's mother is a clerk. She works in a department store. She goes to work by bus. Today Mary and her
parents go to the zoo. Monkeys are Mary's favourite animals.
1. How does Mary's father go to work ?[ ]
A. By bus.
B. By car.
C. On a bike.
D. On foot.
2. is Mary's favourite colour.[ ]
A. Red
B. Black
C. Blue
D. White
3. Mary likes .[ ]
A. tiger
B. elephant
C. monkeys
D. giraffe
4. Who works in a department store ?[ ]
A. Mary.
B. Mary's father.
C. Mary's mother.
D. We don't know
（）是指随大气扩散的污染物通过沉降或降水等途径进入水体，如放射性沉降物、酸雨等。
A、自然污染源
B、化学性污染源
C、扩散污染源
D、生物性污染源
