问题补充：
More than five doctors and rescuers have got to Yushu County up to now.
A. thousand
B. thousands
C. thousand of
D. thousands of
答案：
(答案→)A. thousand
B. thousands
C. thousand of
D. thousands of
解析：考查具体数字的表达法。“数词+dozen,thousand，hundred，million等数量词表确切数字。不加s，不加of。故选答案A。但表约数时加s，加 of。如 hundreds of“数以百计的，好几百的”，thousands of数千的。句意：目前有超过五千个医生和营救者到达玉树。
