题目

Alone, top, both, become, dangerous, die, afraid, freeze, while,warm Do you enjoy climbing mountains? I’d like to tell you a true story about John and Peter. They were 1     mountaineers. As John was experienced, he was always asking Peter to copy his example. “Would you like to stand on the 2     of the world, Peter?” “Of course . It has already 3    my dream,”Peter answered. On a sunny morning, the two men started for the top of Mount Qomolangma. After they climbed over one of the most 4     slopes, they found a man lying in the snow. “He’s going to 5 �已知函数.（I）判断函数的奇偶性并证明；（II）若，证明：函数在区间上是增函数.