题目

Although the teacher did not mention any names，everybody knew who he was ________. A．attending to                           B．turning to C．referring to                           D．talking to   答案：C 考查动词词组辨析。attend to专心，注意；照顾；turn to转向，变成；求助于；致力于；refer to查阅；提到，谈到；打听；talk to sb.找某人谈话。  某水库大坝高20米，背水坝的坡度为1：，则背水面的坡长为（ ）A．40米B．60米C．30米D．20米