• (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)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

Adult and children’s tickets were sold for the circus. If 100 adult tickets and 200 children’s tickets were sold, how much money was collected for ticket sales
(1) Two adult tickets and four children’s tickets cost $ 40.
(2) Adult tickets cost twice as much as children’ s tickets.