11. Frequently, the onset of leukemia is more gradual, the patient becoming aware during the course of a month or two of progressive weakness, anorexia, pallor and lowgrade fever.

[译文]白血病的发病往往比较缓慢，患者能意识到在一二个月内有进行性衰弱、厌食、苍白和低热等症状。

[说明]形容词aware的支配介词为of，被起时间状语作用的介词短语 during the course …or two 所分隔。

12. A careful inquiry should be made into recent localized infections, especially of the ear，and trauma to the head, as these predispose to secondary bacterial meningitides.

[译文]对近期的局部感染应作仔细的了解，特别是耳朵的感染和头部的外伤，因为这些感染易诱发继发性细菌性脑膜炎。

[说明]名词inquiry的支配介词为into，被句子谓语should be made所分隔。