题干
—I always get ______ before the exam and I can't go to sleep!
—You should relax yourself．
A：happy
B：sad
C：nervous
答案(点此获取答案解析）
C
—I always get ______ before the exam and I can't go to sleep!
—You should relax yourself．
A：happy
B：sad
C：nervous
是函数
的反函数，且
，则
=（ ）