What are the main first aid measures?() A: Keep the airway open B: Supine or antishock position (Extended) C: Treatment of primary injury D: Sedative, analgesic and warm E: All of the above

Which one of the following statements is correct? A: Benzodiazepines directly open chloride channels. B: Benzodiazepines show analgesic actions. C: Clinical improvement of anxiety requires 2 to 4 weeks of treatment with benzodiazepines. D: All benzodiazepines have some sedative effects. E: Benzodiazepines, like other CNS depressants, readily produce general anesthesia.