【单选题】Sometimes children are _______ enough to create ______ stories.
A.
imaginative, imaginary
B.
imaginary, imaginative
D.
imaginative, imaginable
【单选题】函数y=cos 2 (x- π 2 )是( )
【简答题】函数 y=cos x 的周期是 _________
【单选题】___________ is an example that describes an imaginary or fictitious situation.
A.
A hypothetical example