如果100美元可以兑换更少的人民币，说明 [ ] A．美元汇率升高 B．人民币贬

There _____ no hospitals in my town sixty years ago.     [ ]

A. is

B. was

C. are

D. were

The teacher, with 6 girls and 8 boys of her class, _____ visiting a museum when the earthquake struck.[ ]

A. was            

B. were          

C. had been         

D. would be

降压同时伴心率加快的药物是

A．雷米普利

B．拉贝洛尔

C．肼屈嗪

D．哌唑嗪

E．硝苯地平

慢性粒细胞白血病与类白血病反应最主要的区别是

A．外周血白细胞计数高

B．外周血可见中幼粒、晚幼粒细胞

C．脾大

D．Ph染色体阳性

E．骨髓检查：粒细胞增生活跃

下血，先便后血，此______，______主之。