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【单选题】
由高中数学可知，对于连续函数f(x)，若f(x1)与f(x2)值的符号相反，则在x1和x2之间必存在x0，使得：f(x0)=0（该点称为"零点"）。设有VB函数：Private Function f(x As Single) As Single 可以返回f(x)的值（函数体没有给出）。下面程序的功能是从键盘输入2个实数x1、x2，判断在x1、x2之间是否存在零点。Private Sub Command1_Click() Dim x1 As Single, x2 As Single x1 = InputBox("请输入一个实数x1") x2 = InputBox("请再输入一个实数x2") If ( _______________ ) Then Print "在"; x1; "与"; x2; "之间存在零点" Else Print "不能确定在"; x1; "与"; x2; "之间是否存在零点" End IfEnd SubPrivate Function f(x As Single) As Single ……End Function为使上面程序可以实现该功能，程序代码中横线处应填写的代码是_______________。A.
f(x1) >0 Or f(x2) < 0
B.
f(x1) < 0 And f(x2) < 0
C.
f(x1) * f(x2) < 0
D.
f(x1) * f(x2) > 0
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举一反三
【简答题】A: We could smell the pie baking in the kitchen. B: We could smell the pie bake in the kitchen.
【简答题】裁剪(clipping)和重绘(repainting)有什么联系?
【判断题】Back-formation,another way of creating new words, can also be seen as a kind of clipping.
A.
正确
B.
错误
【单选题】We could smell that some one _____ a cigar.
A.
would be smoking
B.
was smoke
C.
had been smoking
D.
would be smoked
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【简答题】A: We could smell the pie baking in the kitchen. B: We could smell the pie bake in the kitchen.