The development most likely to lead to an increase in the velocity of money is:（）

A. a decrease in money interest rates resulting from restrictive fiscal policy.

B. an increase in the expected rate of inflation.

C. a sharp decline in the use of credit cards.

以下关于艾滋病（AIDS）的叙述，错误的是（）

①AIDS患者出现病症的直接原因是其它病原体感染

②HIV攻击人体免疫系统，特别是T淋巴细胞

③HIV侵入人体后存在潜伏期，原因是潜伏期HIV复制能力较弱

④感染HIV的人称为AIDS患者，应尽快治疗

⑤正常人和AIDS患者拥抱就可能被感染

A.②③⑤

B.①④⑤

C.③④⑤

D.①②③