患者，男性，37岁。HBsAg阳性28年。近2个月出现持续性肝区疼痛，消瘦、纳差。查体：肝脏肋下6cm，质硬，表面不平，压痛(+)。B超发现肝脏实性占位。

下列哪项检查对明确占位病变的性质最有价值

A．腹部CT

B．腹部MRI

C．X线肝动脉造影

D．放射性核素肝显像

E．肝穿刺活检

Half the world’s population ______ water shortages within 15 years according to the World Bank, just one of many recent alarming reports on the world’s fresh water supply.

A．are suffering

B．have been suffered

C．will suffer

D．were suffered