______ have been made for nearly three decades to increase the amount of precipi

游客2023-12-27  21

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A Devices装置,设计,策略,设备;B.Hypotheses臆测,假定;C.Attempts努力,尝试,企图;D.Commissions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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