高一英语周报课标第四期答案

37.考查传统发酵技术解析:在葡萄酒的自然发酵过程中,发酵液一般不需要严格的灭菌处理,原因是发酵过程主要是利用附着在葡萄皮上的野生酵母菌,若对葡萄进行严格的灭菌处理则会杀死酵母菌。葡萄酒发酵过程中主要的菌种是酵母菌,其代谢类型是异养兼性厌氧型。因此,发酵过程中先要通气,目的是使酵母菌有氧呼吸大量繁殖,然后再密封发酵。为了检测酵母菌发酵过程中是否产生了酒精,可取少量发酵液与酸性重铬酸钾溶液混合,若岀现灰绿色,说明发酵过程已产生酒精。发酵液中的酒精浓度般不超过16%原因是酒精浓度较高会抑制酵母菌的生命活动。答案:(除标注外,每空2分)(1)不需要(1分)发酵过程主要是利用附着在葡萄皮上的野生酵母菌,若对葡萄进行严格的灭菌处理则会杀死酵母菌(2)酵母菌异养兼性厌氧型大量繁殖(3)酸性重铬酸钾灰绿色酒精浓度较高会抑制酵母菌的生命活动

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

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