一个容量为n的样本，分成若干组，已知某数的频数和频率分别为40、0.125，则n的值为 [ ]
A.640
B.320
C.240
D.160
答案：B
---Would you like to join us in basketball?
---_______ but I have to study for my science test.[ ]
A．I wouldn't
B．I'd love to
C．I'd like
D．I don't like it
阅读下列流程图：
当用判定覆盖法进行测试时，至少需要设计（）个测试用例。
A．2
B．4
C．6
D．8
