女性，45岁，皮疹半年，加重伴高热1周，伴活动后轻度的呼吸困难，辅助检查提示：尿蛋白1.0g/L，超声心动检查提示肺动脉高压，患者1日前无明显诱因突发抽搐，10分钟后自行缓解，头颅CT检查未见异常表现。

为进一步明确诊断，首选的化验是（）

A.脑脊液及血清中自身抗体检测

B.胸片

C.冠状动脉造影

D.血常规检查

E.心肌显像

I wonder why Jack always gets good marks when he does only ________ the others.

A．half as much as

B．as much as half

C．half as many as

D．as many as half