题目

阅读短文，回答下列问题（可简略回答。）      Winter is a time for many exciting sports: sledding (乘雪橇), skating and skiing. Skating and skiing need lots of skills. Sledding gives you good exercise and is lots of fun!      A sled looks like a boat. It can move easily over snow or ice. Early sleds were made of wood. Now some better sleds are made of glass.      Sleds can be pulled（被拉）by animals. In some very cold parts of the world, people make animals like dogs, horses, and reindeer (驯鹿) pull(拉) goods(货物) or people in sleds.    已知乙炔（C2H2）是一种非常重要的有机物，实验室常用电石（主要成分是CaC2）和水反应制得乙炔和一种常见的碱，写出该反应的化学方程式    ，若让你选择发生装置，你认为应选择    （填“制CO2”或“用加热高锰酸钾制O2”），乙炔是一种具有可燃性，不溶于水的气体，你认为应选取    方法收集乙炔．