2. 外语
  3. Attempts have been made for nearly three decades to increase the amount of precipitation from clouds by seeding them with salt o

Attempts have been made for nearly three decades to increase the amount of precipitation from clouds by seeding them with salt o

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问题 Attempts have been made for nearly three decades to increase the amount of precipitation from clouds by seeding them with salt or silver iodide.
选项 A、Devices
B、Hypotheses
C、Efforts
D、Suggestions
答案C
解析
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