男孩，6个多月。因高热14d。伴咳嗽、气促、食欲不振、面色苍白来院就诊，有结核接触史。体温38.6℃，呈弛张热型。查体：浅表淋巴结黄豆大小，颈部抵抗，两肺听到细湿啰音，肝肋下3.5cm，质中，脾肋下及边。胸部X线透视阴性。

为了明确诊断，对该病儿首先应做下列哪项检查（）

A.痰液或胃液检查有无结核菌

B.腰椎穿刺送脑脊液检查

C.肺部X线正侧位摄片

D.PPD试验

E.血清抗结核菌纯蛋白衍化物（PPD.-IgG检测

—Why didn't you open the door for me?

—Sorry, dear. I             in the kitchen. I didn't hear you. [ ]

A. am cooking

B. cooked

C. was cooking

D. will cook