His role,therefore,is completely different.He is there to make sure that the viewer does not miss some point of interest,to help him insist on particular things,and to（ ）the images on the television screen.

A.正回购
B.场外协议回购
C.要约回购
D.场内公开市场回购

A.内在价值可以是正数也可以是负数
B.内在价值反映权证有效期内股票价格波动所隐含的收益
C.无论股票价格是多少，只要股价上涨，认股权证的内在价值就增加
D.只有股票市价高于行权价格时，认股权证的内在价值才大于零