单项选择题
What could be said about the adrenalin （）
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
单项选择题 It is （）that mainly helps you respond to a dangerous or stressful situation（）
单项选择题 In this passage, the author is mainly discussing the function of（）
单项选择题 The author can't remember his relatives clearly because（）
