吉芬物品是一种需求量与价格同方向变化的特殊商品。
参考答案：对
Great changes ____________ in my hometown in the past few years.
A have taken place. B. took place C. have been happened D. were taken place
医学伦理学基本理论不包括的是（）
A.生命神圣论
B.医学人道论
C.结果论与功利论
D.非结果论与义务论
E. * * 论
