单项选择题
A．It is on the shelf． B．It is too expensive． C．It is in short supply． D．It is no longer flesh．
A．It requires few professional skills． B．It exercises many parts of the body． C．It is a new item of fitness programs． D．It is popular with most club members．
A．It needs new employees badly． B．It gives quick responses routinely． C．It is a newly established business． D．It is very cautious in decision making．