____,以手抚膺坐长叹。(李白《蜀道难》)
要使视野中单个细胞最大,你认为应选用的显微镜镜头组合是( )
204×0.8 ____204 32×0.9 ____32
875×1.5____875 132×1.2 ____132
English is widely used _______ travelers and business people all over the world.