• (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．

At a restaurant, Luis left a tip for his waiter equal to 20 percent of his entire dinner check, including tax. What was the amount of the dinner check
(1) The sum of the dinner check and the tip was $16.80.
(2) Luis’ tip consisted of two bills and four coins.

66岁老年患者，长期素食，面色苍黄，表情呆滞，手及下肢颤抖。检查发现肝、脾增大，血红细胞1×10¹²/L，血红蛋白65g/L，血清铁正常，叶酸、血清维生素B₁₂降低。

该患者的健康教育中最重要的是

A．坚持服药
B．改变素食习惯
C．加强锻炼
D．预防感冒
E．注意休息