形成黄体由下列哪种或哪些结构形成
A．卵泡外膜
B．卵泡内膜
C．卵泡颗粒细胞
D．A+B+C
E．B+C
参考答案：D
下表中所列的检测事项，所选用的试剂及预期结果都正确的是
A．①③
B．②③
C．①④
D．②④
Which of the following is the most appropriate title for the passage
What is the contribution of global tourism industry to the GDP
A．20%.B．15%.C．10%.D．9%.
