• (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．

David has three credit cards: a Passport card, an Everywhere Card, and an American Local card. He owes balances on all three cards. Does he owe the greatest balance on the Everywhere Card
(1) The sum of the balances on his Everywhere Card and American Local card is $1, 350, which is three times the balance on his Passport card.
(2) The balance on his Everywhere Card is

of the balance on his Passport card and

of the balance on his American Local card.

在给社区口腔保健人员讲课时，王老师指出口腔健康促进的原则是（）。

A．发挥领导部门的主导作用

B．全社会积极参与

C．个人集体相结合

D．发挥专业人员的主导作用

E．发挥公司企业的积极性