Sarah many places of interest in Beijing already.A. visited B. has visited C. will visit D. visits B [解析] 句意:Sarah已经参观过北京许多有趣的地方了.本题考查动词时态.根据句意和already可知此处要用现在完成时.故选B.
To investigate the support of residents in China for the provision of AEDs in public places and the factors affecting support. Subject and methods A cross–sectional study was conducted with questionnaires among residents of 120 sampled cities, and ANOVA analysis and stepwise regression were used to...