One real estate investment has the following characteristics:

A．Annual rental income

B．$18000000

C．Annua operating expenses

D．$1200000

E．Available mortgage rate

F．6%

G．Financing percentage

H．90%

I．Required rate of retum

J．15%

K．Estimated holdng period

L．5 years

M．Investor’s tax rate

N．25%

关于黄体，正确的是（）

A.排卵后卵泡腔出血形成黄体

B.排卵后10天黄体体积和功能达到高峰

C.若卵子未受精，黄体逐渐退化，黄体功能限于14天

D.待黄体中的血液被吸收后即变成白体

E.只有在下次月经来潮后黄体才完全衰退