【简答题】A.To indicate how climbers communicate. B.To show that climbers enjoyed many comforts. C.To show that modern telephones can work at high latitude. D.To emphasize how small equipment had become.
【简答题】A.To indicate how climbers communicated. B.To show that climbers enjoyed many comforts. C.To show that modern telephones work at high altitudes. D.To emphasize how small some equipment had become.