简述常用的认知策略。
参考答案：（1）复述策略
（2）精细加工策略
（3）组织策略
The farmers ________ on the farm when a UFO flew over their heads. [ ]
A. worked
B. work
C. are working
D. were working
碱金属对烧结矿的还原过程，还原粉化和（）都有影响。
