--- How about the price of these washing machines?

--- They are at least equal in price to, if not cheaper than, _____ at other stores .

A．others

B．ones

C．that

D．those

玉米、水稻等农作物在开花时节，如果阴雨连绵，玉米、水稻等作物的子粒会出现空瘪，影响粮食产量，其主要的原因是[     ]

A．光照不足，缺少营养

B．下雨影响传粉

C．下雨影响开花

D．阴雨天气病虫害多