He________to put any sugar into the soup. [ ]
A. needn't
B. needs
C. doesn't need
D. need
C
圆(x-1)2+(y-2)2=4和直线(1+2λ)x+(1-λ)y-3-3λ=0相交于两点()。
(1)
(2)
A.条件(1)充分,但条件(2)不充分
B.条件(2)充分,但条件(1)不充分
C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分
D.条件(1)充分,条件(2)也充分
E.条件(1)和(2)单独都不充分,条件(1)和条件(2)联合起来也不充分
能动的反映论