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______ have been made for nearly three decades to increase the amount of precipi
______ have been made for nearly three decades to increase the amount of precipi
游客
2023-12-27
35
管理
问题
______ 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、Attempts
D、Commissions
答案
C
解析
名词辨析ADevices装置,设计,策略,设备;BHypotheses臆测,假定;CAttempts努力,尝试,企图;DCommissions委任,代办(权),佣金;本题讲的是:已做了近三十年的尝试,试图在云层中加入盐或碘化银来增加降雨量;因此C为答案。
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