第一节短文改错(共10小题;每小题1分,满分10分)My son, Mark, volunteers to help Cherie, a young runner, at a local Special Olymp csSincevolunteeredAlthough/Though/WhileCherie was disabled, she was happy and enthusiastic. Mark encouraged her, kept her calm, and let her to, know whenit was time to line up for het race. When the starting signal sounded, she took off as a flash of lightning, leaving herlikefellow racer behind. As he was near the finish line, she stopped, turned around, and waved to the other runners,shencouraged them to hurry. She waited for them but they could all cross A finish line together. It was realally a veryenouragingspecially finishspecial

AA中裂化汽油含有碳碳双键,能够使溴水褪色,而己烷是饱和烃,A正确。B中淀粉、纤维素是混合物,而同分异构体必须是纯净物,B错误。C中蛋白质水解得到的氨基酸是混合物,C错误。D煤中不含苯,煤通过煤干馏可以获取苯,D错误。答案选A。

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