冠桩修复时，桩的直径应为（）。
A.根径的1/4
B.根径的1/3
C.根径的1/2
D.根径的2/3
E.根径的3/4
参考答案：B
Research shows that though students benefit from having parents involved at school, _____ happens at home matters much more.
A．which
B．what
C．that
D．whether
InputBox函数返回值的类型为 ______。
A．数值
B．字符串
C．变体
D．数值或字符串(视输入的数据而定)
