【单选题】Everyone knows that Diaoyu Island belongs ______ China.
【单选题】鉴别脑膜炎奈瑟菌与卡他布兰汉菌的相关试验是
【简答题】I think everyone knows how to swim.英译汉
【单选题】Everyone knows _____ is dangerous to play with fire, but _____ is difficult is to prevent children from playing with fire. [ ]