未知题型 吸痰冲洗液可4小时更换一次，吸引瓶内吸出液不超过其高度的70%-80%（）

未知题型 In the Chinese creation myth, in the beginning of time, there was nothing in the universe except for _____ that took no shape.

单项选择题 会社へ　行く　　　　１時間　かかります。