Ⅰ.单项填空
1. If we can ________ our present difficulties， then everything should be all right.
A. come across B. get over
C. come over D. get off
答案 B
解析 考查动词短语辨析。句意：如果我们能克服目前的困难，一切都应该好起来的。get over有“克服；越过”的意思，为最佳选项。come across“偶然遇见”； come over“突然感到；短暂造访”； get off“下车”。
2. Studies of populations ________ high levels of radiation have shown increased risk of cancer.
A. exposed to B. filled in
C. caught on D. kept up
答案 A
解析 考查动词短语辨析。句意：对于人们接触高核辐射的研究表明会增加患癌症的风险。(be) exposed to“暴露于；接触”，符合句意。fill in“填充”； catch on“理解；变得流行”； keep up“保持”。
3. This morning someone ________ from downtown and asked to see me at two o’clock.
A. called out B. called on
