某同学上肢的伤口感染，医生在其臀部注射药物治疗，药物到达伤口经历的血液循环路线是（）。

A.只有体循环

B.先肺循环，接着体循环，后肺循环

C.只有肺循环

D.先体循环，接着肺循环，后体循环

• (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.