【单选题】听力原文: Today's discussion is about a common animal reaction--the yawning. The dictionary defines a yawn as 'an involuntary reaction to fatigue or boredom'. That's definitely true for human yawns but no...
【简答题】Reading comprehension. Answer the following questions by using the information taken from a dictionary page. (You may read the questions first.) jaguar n.a type of large,yellow-colored cat with black...