2022全国一百所名校最新高考冲刺语文2答案

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25.A【解析】微生物培养前,需对培养基进行高压蒸汽灭菌,接种环、接种针等金属用具应直接在酒精灯火焰的外焰部位灼烧灭菌;利用稀释涂布平板法既能分离微生物又能对微生物进行计数;尿素分解菌的氮源是尿素,其他不能利用尿素的菌就不能生长,所以以尿素为唯一氮源的培养基上可以选择尿素分解菌,尿素分解菌可以将尿素分解为氨,可以使酚红指示剂变红;用以纤维素为唯一碳源的选择培养基,能筛选出分解纤维素的微生物。故选A。

Dear Sir/MadamI'm planning to travel to the USA in the coming JulyTherefore, I'm writing to inquire about travel routesof your agency.【要点一,发出请求ntend to stay in America for about 10 days, durig which I hope to have a look at some unique naturalscenery and have a taste of local customs【高分句型hich引导定语从句】.So, could you please recommend some suitable travel routes? In addition . Id like to know the prices of the routes, covering all the traveling expenses【高分句型二,现在分词 covering作状语】.【要点二,告知相关信息】A reply at your earliest convenience is highly apprecYours,Li Hua