王府井大街是北京最著名商业街，有“（）”之称。
参考答案：金街
Up to now, large quantities of food ____ to Africa to save the starving people. [ ]
A. is sent
B. has been sent
C. have been sent
D. are sent
类天疱疮的IIF抗体滴度与病情相关性为（）
A.平行
B.无明显相关
C.相反
D.正比例
E.反比例
