第28题: [单项选择]动物头骨都含有钙的成分,很难溶解于水。有人曾做过实验,用5公斤猪骨头加上5公斤水,在高压锅里熬10个小时,结果一碗骨头汤中的钙含量不过10毫克,不及一袋牛奶钙含量的1/20。骨头汤里还溶解有大量骨内脂肪,经常食用会引发其他健康问题。因此,喝骨头汤未必是治疗骨质疏松的最佳食疗方法,重要的是注重饮食多样化,多摄入富含钙的食物,如牛奶、豆腐、虾皮、紫菜等。 这段文字意在说明: A. 喝骨头汤有利有弊 B. 预防骨质疏松补钙是关键 C. 如何科学有效补钙 D. 日常生活中多样化饮食最科学 参考答案:C
第30题: [单项选择]{{B}}Questions 11 to 18 are based on the passage you have just heard.{{/B}} A. She was afraid of the professor. B. She didn’t enter her house. C. She didn’t make full preparations for her lessons. D. She lost her key. 参考答案:C 答案解析:[听力原文]
M: Ordinarily you never seem to bet nervous. But why were you so nervous just now when the p