[多选题]存在下列那些情形之一的,为拥有上市公司控制权( )。
A. 为上市公司持股50%以上的控股股东
B. 可以实际支配上市公司股份表决权超过20%,通过实际支配上市公司股份表决权能够决定公司董事会半数以上成员选任
C. 通过实际支配上市公司股份表决权能够决定公司董事会三分之二以上成员选任
D.依其可实际支配的上市公司股份表决权足以对公司股东大会的决议产生重大影响

In the past year, a lot has changed in the field of human spaceflight. (46)In January, President George Bush brushed aside the fact that America’s entire space-shuttle fleet was grounded when he announced grandiose plans to put people back on the moon, and then to launch a manned mission to Mars. (47) In June, Burt Rutan, an American aeronautical engineer, showed that human spaceflight was no longer the preserve of governments by sending a man to the edge of space in Space Ship One, a privately financed vehicle that cost about the same to build as a luxury yacht. That was followed in September by Sir Richard Branson, the British entrepreneur behind the Virgin brand, announcing that he had signed a deal with Mr. Rutan to work on plans for a fleet of five suborbital vehicles developed from Space Ship One.
(48) Now, in the dying days of the year, America’s Congress has passed a bill that unravels a tangle about who would be responsible for regulating