Such poets as Shakespeare _____ widely read, of whose works, however, some _____ difficult to understand.

[ ]

A. are; are

B. is; is

C. are; is

D. is; are

黄体功能不全的病理特点是（）

A．子宫内膜活检分泌反应落后2日以上，腺体与间质发育不同步

B．月经第5～6日增生期内膜和分泌期内膜共存

C．月经后半周期仍为增生期改变

D．腺上皮细胞高柱状，腺体数目增多，无异型性

E．腺上皮细胞大小不一，极性消失，可见核分裂象