若a2+a=1,则-2a2-2a+2012的值为______.
∵a2+a=1,
∴-2a2-2a+2012=-2(a2+a)+2012=-2+2012=2010.
故答案是2010.
The Trojan War ______ by Helen and her beauty.
A.causes
B.is caused
C.caused
D.was caused
成人右手占体表面积的()
A.1%
B.2.5%
C.3%
D.3.5%
E.5%