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

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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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