题目

 -- _______ that the 19th Olympics were held?  -- It was in 2008 ______ a terrible earthquake struck Wenchuan in Sichuan? A. Was it when; that                              B. When was it; that C. Was it when; when                              D. When was it; when 答案：D在我们的日常生活中出现了“加碘食盐”、“高钙牛奶”等商品这里的“碘”、“钙”应理解为　　A. 元素 B. 单质 C. 分子 D. 原子