Attempts have been made for nearly three decades to increase the amount of preci

游客2023-12-26  27

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 名词辨析。attempt努力,尝试:abandon the attempts放弃尝试。device装置:a devicefor opening bottles一个打开瓶子的装置。hypothesis假设:This is only a sortof scientific hypothesis which has not been proved by experiments.这仅仅是一个尚未被实验证明的科学假说。efforts努力,尽力:Please put more effortsinto your school work.请你在功课上再努点力。
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