1、highest,windy,place,usually,snow,dangerous,climb
2、略
3、(1)coldest
(2)highest
(3)bigger
(4)driest
(5)oldest
(6)hottest
(7)China
(8)knives
(9)saltiest
(10)stronger
(11)largest
(12)quietest
(13)strongest
(14)richest
(15)heaviest
(16)biggest
4、(1)D
(2)C
(3)B
(4)D
(5)B