“我为花草呵护，花草向我微笑”，体现了人与自然的和谐相处．“花草”在生态系统中扮演的角色是（ ）
A．消费者
B．生产者
C．分解者
D．非生物部分
答案：B
语汇。（填适当的词，使句子通顺。）
1. I fell at the bus stop. I h_____my arm.
2. She is taking a picture with a c______.
3. Li Ming asks his teacher,"Is English h _______?"
4. The cup fell down, but it was o______.
5. Leaves f______in autumn (秋天).
常用的钻杆本体壁厚为（）mm。
A.12-13
B.7-11
C.7-8
D.11-12
