第18题: [单项选择]Examining bottles of wine is hard work because ______. A. the bottles must be held upside down B. it is difficult to see the particles of dirt C. it requires high level of automatic D. most bottles are all right 参考答案:D 答案解析:文中第五段中间“…is partly because the number of occasions with dirt in the bottle is low”正对应着选项D中的“most bot
