卷行天下的答案及解析

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4.C【解析】用苯酚作为选择培养基中的碳源，A正确；测定培养液中细菌数目常采用稀释涂布平板法，B正确；若④为对照实验，则④中应含除苯酚外的其他碳源，⑤以苯酚作为唯一碳源，C错误；使用稀释涂布平板法或平板划线法都可以在⑥上获得单菌落，D正确

HOne possible version:However,he decided to have a try in spite of thoserisks.He found the sledge.Then,Bob gently carried Janinto the sledge,got in the front,and pushed off.He drovethe sledge with all his heart.Trees came up in front of himquickly by his side.He controlled the sledge carefully notto touch any of them.All he could do was not to scream asfalling over and hitting seemed so near.At last,the town came into view but the sledge gavestrange sounds.Barely slowing down,he went through theicy streets,avoiding anything that could meet the sledge.And the sledge only stopped as he neared the doctor'shouse.The sledge survived through the journey,and brokedown finally.Bob picked up his Jan eagerly and gentlyand made his way into the doctor's house.Luckily,Jan recovered fully from her fever.Love always makesmiracles.