Closed-end funds and exchange traded funds (ETFs) have which of the following characteristics in common（）

A. Both closed-end funds and ETFs stand ready to redeem shares.

B. Shares of both closed-end funds and ETFs trade in the secondary market.

C. The structures of closed-end funds and ETFs prevent shares from trading at a significant premium or discount to NAV.

关于子宫体癌的病理学改变及诊断，不正确的是（）.

A.又称子宫内膜癌，发生在子宫内膜

B.子宫内膜为弥漫性增厚或团块状

C.始发于更年期与绝经期的妇女

D.声像图能显示内膜增厚，故早期即能确诊

E.主要临床表现为 * * 出血