A:②④
B:①③
C:①②
D:③④
—What were they doing from 8:00 to 10:00 p.m. last night?
—They ____ (use) the Internet.
已知点A(﹣2,y1),B(3,y2)是反比例函数y=kx(k<0)图象上的两点,则有( )
改革开放以来,我国非公有制经济以年均20%的增长速度蓬勃发展,解决城镇就业占75%以上。这表明非公有制经济( )