Aeschylus quote about wind, sea, skies and sun rays Can a toilet paper holder be mounted to the side of a fiberglass tub? Adding wireless switch to existing 3-way wired system Is is plausible that we could have neuronal maps of human brains without mind ...
答案(1)Before.考查介词.根据句意,在饭前.根据第二段"Wash your hands. You need to wash your hands with soap and water before you eat, after you use the toilet, and after you touch animals"可知在饭前、上厕所后以及触摸动物之后要洗手.此处总结的是时间状语,此处用before you e...