A.I had an impulse to climb up and try one of those springy beds, but that would have meant using up more energy when I had none to spare, …
 B.By midday we had passed the ten thousand foot mark, but I am not really able to recall the incidents of these hours, for red lights had long since begun to dance in front of my eyes and …
 C.The bamboo here had thinned out a little, and on the heights of the two mountains above we could see the curious productions of the alpine zones, giant heather, giant groundsel and giant lobelias.
 D.After twenty minutes my legs had turned to water again and against the evident displeasure of the guides I demanded lunch.
参考答案：……