Tom is very pleased with the newly-built house which is almost ___ the one he used to live in.

A．the twice size of

B．as twice big as

C．bigger twice than

D．twice the size of

王先生，40岁。突发上腹剧痛3h，转移至右下腹2h后就诊。体检：体温38.4℃，血压120/70mmHg，心率84/min，呼吸20/min。全腹压痛、反跳痛，腹肌紧张呈板样，以剑突下及右下腹为显著，肠鸣音消失，移动性浊音（士）。血白细胞9.0xlo，/L，中性粒细胞78％。。

为明确病因和诊断，首选的检查项目是（）

A.急诊腹部CT

B.腹腔穿刺

C.腹部B超

D.直肠指诊

E.腹部立位平片