All the athletes _______ the nice service during the London Olympics.
A:were pleased
B:were pleased with
C:were pleasure
D:were pleasure with
SiO2+2C 高温__ Si+2CO↑.下列分析正确的是( )
设等比数列{an}的前n项和为Sn若S10:S5=1:2,则S15:S5= ( )
—Birds Home.