[单项选择]It's a general belief that a child' s later character and personality is _________ decided by his early experiences both at home and in school. A. chiefly B. by chance C. entirely D. seldom
第8题: [单项选择]唾液的pH范围在 A. 5.0~7.0 B. 5.6~7.6 C. 6.0~7.0 D. 6.5~7.5 E. 6.5~8.0 参考答案:B 答案解析:[解析] 此题考查的是唾液的基本知识,要记住唾液是无色、无味、黏稠性液体,比重在1.002~1.008之间,pH5.6~7.6,平均6.8,所以此题的正确答案是B。