单项选择题
A．adapt B．satisfied C．content D．meet
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．has a great deal of trouble doing mental arithmetic B．lacks some of the qualities required of a scientist C．just reads about other people’s observations and discoveries D．comes up with solutions in a most natural way