题目

Mt Qomolangma is the 【1】 (world) highest mountain. How hard 【2】 (be) it to climb this mountain around 60 years ago? You can find out by 【3】 (watch) the film Climbers. The film tells the real stories of Chinese climbers, who climbed the mountain in 1960 and 1975.On the northern slope of Mt Qomolangma, there is a 30-meter-high cliff (峭壁). It is 【4】 (possible) for climbers to get to the top without going over this cliff. In 1960, a Chinese climbing team tried to reach the top. The four members 【5】 (them) stood on each other's shoulders to climb the cliff. Although they did1．求比值：7.5：4；                    $\frac{1}{4}$：50．