Critics sometimes accuse companies of using ads to mislead us by making us believe a certain product

is better than it really is or _____ we will be happier if we buy it. [ ]

A. whether

B. that

C. /

D. how

采用速测仪或测距仪测细部点时，应进行测桩检查，仪器对中偏差不应大于( )。

A．1mm

B．3mm

C．4mm

D．5mm