题目

Direction: For each blank in the following passage there are four words or phrases marked A, B, Cand D. Fillineach blank with the word or phrase thatbest fits the context.In 200 Years Cows May Be the Biggest Land Mammals (哺乳动物) onthePlanetAround 13,000 years ago North America had a wider variety of mammals than modern Africa.There were multiple horse species, camels and some now-extinct animals.And such1creatureswere not just found in North America. On every continentmammals on average were a lot larger from around 2.5 million until about 11,700 years ago.Scientists have long debatedwh取北京某地区某村土壤浸出的溶液，加入无色酚酞溶液后显红色．下表为四种农作物适宜生长的PH范围，你认为该村土壤比较适宜种植的农作物是（　　）：农作物     水稻       茶树        玉米       马铃薯    pH    6.0～7.0   6.0～7.0  7.0～8.1   4.8～5.5．