布尔型数据在计算机内存中占( )位bit。
A．4
B．3
C．2
D．1
参考答案：D
The task wasn't worth our efforts at all. It made little ______ no matter how hard we worked. [ ]
A. effect
B. use
C. result
D. difference
健康教育计划总体目标的三个“W”是指（）
A.when，why，which
B.who，what，when
C.when，why，what
D.when，where，what
E.who，what，why
