He is too old to _____ the name of that book. [ ]

A. pick up

B. think of

C. come up

D. fill in

丈量某长方形的长为a=20，宽为b=15，它们的丈量精度( )。

A．一定相同

B．a精度高

C．b精度高

D．不能进行比较