根据题意得,x+2=0,y-2=0,
解得x=-2,y=2,
所以,xy=(-2)×2=-4.
故选D.
All the buildings look old but the library _________.
A.need to be repaired
B.needs repairing
C.needs be repaired
D.need repairing
"膻中"的另一个名称是()
A.髓海
B.血海
C.气海
D.水谷之海
E.十二经脉之海