The Great Wall is famous, so every year _______people come to visit it.A.million B.million of C.millions of D.two millions 答案:【答案】C【解析】句意:长城很出名,所以每年有数百万的人来参观。考查数词用法。此处表示的是概数, millions of 表示“数百万的”。A,B,D选项表述错误。故选C。设x是实数,且满足等式+=cosθ,则实数θ等于(以下各式中k∈Z)( )A.2kπ B.(2k+1)π C.kπ D.kπ+