Cathy was born blind(天生是盲的), so she has __________ seen our beautiful world.
A:often
B:sometimes
C:seldom(很少)
D:never
下面是几个同学对竞争的态度,你认为正确的是( )
农作物A
农作物B
肥料
成分
N
+
﹣
P
K
产量
100
54
83
65
34
70
55
40