A. In the Middle East. B. In Europe. C. On the North American continent. D. In Spain. 参考答案:C 答案解析:[考点] 推断题 [解析] 由文章第二句...the earliest remains of primitive horses have been found on the North Amer
第35题:[单选题] 单纯性甲状腺肿的主要原因是: A. 食物长期含铁多 B. 甲状腺激素分泌过多 C. 食物长期含钙少 D. 食物长期含碘少 E.甲状腺素分泌时多时少 参考答案:D