This is one of the most beautiful pictures of scenery that ______ displayed here.
A. is
B. are
C. has been
D. have been
对于要监测、调整用药方案者取样时间是
A. 多点取样
B. 用药前取样
C. 达稳定浓度后取样
D. 立即取样
E. 用药后取样
At the bus stop ______ a soldier and two young people on their way to North Carolin
A. wereB. wasC. isD. sits and waits
对鉴别输精管阻塞有重要价值的实验为
A. 精浆乳酸脱氢酶测定
B. 精浆果糖测定
C. 精浆柠檬酸测定
D. 酸性磷酸酶测定
E. 精子顶体酶测定