子宫内膜异位症用性激素治疗主要作用是
A．调节月经周期
B．减轻痛经程度
C．精神安慰
D．抑制排卵
E．促进排卵
参考答案：D
Mathematics as well as physics _______ very important to any student who wants to enter a good university. [ ]
A. are
B. is
C. was
D. were
在实体间的联系中，学校和校长两个实体型之间存在 (6) 联系，而老师和同学两个实体型之间存在 (7) 联系。
