单项选择题
A．regulations against job discrimination B．the safety of other performers and the audiences C．doing the right thing D．making a lot of money
A．traditional circus B．camp with blue and yellow tents C．modern circus with many acrobatic and gymnastic acts D．circus based in San Francisco
A．they haven't practiced enough B．the equipment is in need of repairs C．they perform risky acts without nets D．some are HIV positive