化简:3(a+5b)-2(b-a).
原式=3a+15b-2b+2a=5a+13b
----Doctors, it seems that you like to work with animals.
----Yes, I think animals should ______ as our friends.
A.regard
B.be regarded
C.be regarding
D.are regarded
The first memorial park to the 87,000 dead and missing from China's May 12 earhquake,which was revised the magnitude from 7.8 to 8.0 on the Richter _____,opened on Wednesday in the southwestern Sichuan Province.
A.degree
B.sign
C.scale
D.mark