Question

3. Monkeys are well known for their grooming habits;they spend hours carefully cleaning bits of dirt straw from their coats.(   )

Answer 1

3. 干净的。句意：猴子们以它们干净的习惯著称；它们会花费几个小时仔细地清理它们皮毛上的些许脏草。根据句意可知 grooming和cleaning词义相近。