試題詳解

21. In humans, the follicular cells that remain behind in the ovary following ovulation become _____.
(A) the ovarian endometrium that is shed at the time of the menses
(B) a steroid-hormone synthesizing structure called the corpus luteum
(C) the thickened portion of the uterine wall
(D) swept into the fallopian tube
(E) the placenta, which secretes cervical mucus