题目

       On the lawn in the park lies a boy, _________ mother seated beside him, listening to music.        A. his                           B. whose                      C. and his                     D. who 答案:B下图表示某有机物中加入酶后,置于0℃~80℃环境中有机物分解总量与温度的关系图。据图判断,如果把这些物质置于80℃~0℃环境中处理,其关系图应为( )
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