English has become the most widely spoken language in the world ______ its special role(作用) as

an international language. [ ]

A. because

B. from

C. with

D. because of

临床情景：患儿，男性，11岁。头痛、发热3天，伴有喷射状呕吐。急诊室初步诊断为急性脑膜炎。需作脑脊液检查。要求：请为患儿行腰椎穿刺并测脑脊液压力。