推销用语的要点，以下说法错误的是（）。
A、礼貌
B、措辞
C、生动
D、幽默
参考答案：D
老师和家长只要是出于对孩子的关心爱护，就可以看孩子的日记和信件。 [ ]
________ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
A．Even if
B．As far as
C．If only
D．So long as
