第6题: [单项选择]正常胆囊长多少厘米() A. 6.5~12.5cm B. 7.5~10cm C. 9.5~15cm D. 10~20cm E. 4~6cm 参考答案:A
第7题: [单项选择]Distance education is different from self-study in that it ______. A. provides training-in-residence for students B. caters to the interest of each individual student C. is available to vast majority of students D. offers instructional service to students 参考答案:D 答案解析:从第二段第一句话“Distance education and self-study are different.Serf-study materials provide no instruction