-3,0.04,-(-2),0,-|-5|,-2.1中非负数的个数有 ( )
A:1个
B:2个
C:3个
D:4个
每千克苹果约为(____ )元。(精确到角)
有学者认为“在唐朝虽然每年平均只有二三十人通过考试,但…这一制度为天资聪颖却非士族豪门出身的人提供了机会”材料所说的制度是( )
—When do you get up every day?—I usually get up_____ six o'clock.