若a=b，b=c，c=d，则a和d之间的关系式为______．
∵a=b，b=c，
∴a=c．
又∵c=d，
∴a=d．
故填：a=d．
We firmly believe that ______ the new examination system comes into existence, completely new situations will arise.
A．considering
B．supposed
C．providing
D．given
一个数a（a＞O）乘分数，积一定小于每一个乘数．______．
