单项选择题
A．the causes for his successes B．some of his failures C．another part of his personality D．why he was left behind the modern competition
A．It is secreted by the kidneys into the bloodstream. B．It is hormone that prepares the body for emergencies. C．It is the only useful hormone produced in the body. D．It is essential to sustain lif
A．and B．but C．yet D．so