____ has recently been done to provide more buses for the people, a shortage of public vehicles remains a serious problem. A、That B、What C、In spite of what D、Though what
Beijing plans to build huge free or low-cost parking lots beyond the Fourth and Fifth Ring Roads to encourage more car owners to take buses or subways to the downtown area．
是圆O的直径，
切圆O于
点，
切圆O于
点，交
的延长线于
点，若
，
，则
_________。 
，所以EA=1，故
.