向目标人群宣传预防艾滋病知识，是希望改变影响行为的（）
A.倾向因素
B.促成因素
C.强化因素
D.环境因素
E.以上都不正确
参考答案：A
---- Did the judge ask you many questions? ---- Yes, and ______.
A．they were difficult to be answered
B．to answer them was to be difficult
C．they were difficult to answer
D．they had difficulty in answering
非附着性龈下菌斑中最主要的细菌为
A．革兰阳性兼性菌
B．革兰阳性需氧菌
C．变形链球菌
D．革兰阴性厌氧菌
E．唾液链球菌
