S . for millennia , but this latest stretch of dry weather coupled with extreme heat has proved especially persistent - and _ .

27.Periods of drought have bedeviled ( 长期搅扰 ) the Southwestern U . S . for millennia , but this latest stretch of dry weather coupled with extreme heat has proved especially persistent - and _ .

 A. perilous

 B. joyful

 C. pleasant

 D. abundant

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