单项选择题
It is （）that mainly helps you respond to a dangerous or stressful situation（）
A．a signal sent by your brain B．the special function of the adrenal gland C．all stimulated parts of your body D．All of these
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（）
单项选择题 It can he inferred from the passage that the author was（）
