生物植被在自然中的生态作用有（）
A.保持水土
B.净化空气
C.为其它动物提供食物
D.经济利用价值
参考答案：A, B, C
看图，补全单词完成下列句子。
1. is fa than .
2. is sl than .
3. She is ta than Li Ming.
4. My teacher is o than I.
5. is about (8,500) kilometres from .
我国《行政复议法》中规定的派出机关是指（）
A、行政公署
B、公安派出所
C、区公所
D、街道办事处
is fa than 
. 
is sl than 
. 
She is ta than Li Ming. 
My teacher is o than I. 
is about (8,500) kilometres from 
.