第23题: [单项选择]食堂购进200斤含水量为90%的西红柿,3天后再测试发现西红柿的含水量变为80%,那么这批西红柿的总重量共减少了( )千克。 A. 100 B. 10 C. 20 D. 50 参考答案:D 答案解析:[解析] 西红柿的水分蒸发,但水分之外的其他物质的重量并没有改变,由此可知现在西红柿的重量为:200×(1-90%)÷(1-80%)=100(斤)。那么这批西红柿的重量共减少了200-100=100(
第25题: [多项选择]内脏痛觉的特点() A. 定位精确 B. 有牵涉痛 C. 对牵拉烧伤敏感 D. 对炎症、切割敏感 E. 对缺血敏感 参考答案:B, E
第26题: [单项选择]Why were US diplomatic team evacuated from the capital of Central Mrican Republic A. Because of a wide-spread of disease. B. Because of fears rebels could seize the capital. C. Because of the termination of diplomatic relations. 参考答案:B 答案解析:[听力原文]
Security is a top concern in the capital of Central African Republic. After the US ambass