题干
—____________?
—He has short straight hair and is of medium build.
A：How is he?
B：What doe he look like?
C：What does he do ?
D：Where did he go last weekend ?
答案(点此获取答案解析）
B
（ ）
上定义的函数
是偶函数，且
，若
上是减函数，则