问题
选择题
Uncle _____ exercises.
It's not good for his health. [ ]
A. sometimes
B. seldom
C. often
D. always
答案
答案：B
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Uncle _____ exercises.
It's not good for his health. [ ]
A. sometimes
B. seldom
C. often
D. always
答案：B
中国自春秋战国就步入了铁器时代，铁器的制造和使用在中国古代社会居于重要的地位。材料一 春秋战国时期的铁器
 | |
| 铁锄 |  |
| 铁犁 |  |
| 铁镰 |
（1）依据材料一，分析铁器的使用对当时社会经济产生的影响。