题目

A new collection of photos brings an unsuccessful Antarctic voyage back to life. Frank Hurley’s pictures would be outstanding----undoubtedly first-rate photo-journalism---if they had been made last week. In fact, they were shot from 1914 through 1916, most of them after a disastrous shipwreck(海滩), by a cameraman who had no reasonable expectation of survival. Many of the images were stored in an ice chest, under freezing water, in the damaged wooden ship.   The ship was the Endurance, a small, tight, Norwegian-built three-master that was intended to take Sir Ernest Shackleton and 某种止痛药不影响神经元的结构和功能，却能在一段时间内阻断神经冲动向感觉中枢的传导，它的作用部位最可能是A．突触前膜B．细胞体C．突触间隙D．树突