【简答题】布尔类型的值包括True和False,我们用( )表示 True 。
【单选题】She is so careless with her spelling that she often ______ letters.
【单选题】已知实数 满足 ,如果目标函数 的最小值是 ,那么此目标函数的最大值是( )
【单选题】What conditions does the writer make when she gives a cat a home?
A.
She expects the cat to obey her.
B.
The cat must observe a few necessary rules.
C.
The cat must accept the writer's authority.
D.
The cat will stay only if she behaves herself.
【简答题】若 ,函数 的最大值是0, 则此函数的最小值是___________.