题目

使用显微镜观察同一视野细胞时，看到的细胞数目最多的镜头组合是（ ）①目镜5×②目镜15×③物镜10×④物镜40× A . ②③ B . ①④ C . ①③ D . ②④ 答案：CEvery year, millions of people visit the Palace Museum, and many of ________ are foreigners．A.themB.thatC.whomD.what