【单选题】
Attempts have been made for nearly three decades to increase the amount of precipitation from clouds by seeding them with salt or silver iodide.
A.Devices
B.Hypotheses
C.Efforts
D.Suggestions
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根据网考网考试中心的答案统计,该试题:
29%的考友选择了A选项1%的考友选择了B选项66%的考友选择了C选项4%的考友选择了D选项