C．Because he met a black bear.

　　D．To take photos of the beautiful scenery.

　　解析：　推理判断题。 由第一段的I was afraid of bears.That's what was keeping me from walking the trail alone以及第二段作者遇到一起同行的Ron和Carol后的如释重负可知，在Chilkoot Trailhead标牌前驻足15分钟的作者，因为害怕熊而紧张地不敢独自徒步旅行。

　　答案：　A

　　2．The author hiked along the Chilkoot Trail to .

　　A．look for gold

　　B．search Alaska for bears

　　C．enjoy the beauty of nature

　　D．find inspiration for his writing

　　解析：　推理判断题。由第三段的I was writing a book about the Klondike Gold Rush，and I wanted to follow in the footsteps of the miners to know what it was really like可知，作者此行是为了寻找写作灵感。

　　答案：　D

　　3．When crossing the Chilkoot Trail，the author .

　　A．hurt himself by accident

　　B．once tried to take a boat trip

　　C．got help from two local miners

　　D．was almost killed by a brown bear

　　解析：　细节理解题。由第四段的As I was looking around at the beautiful scenery in the forest，I tripped over a big tree root and injured my ankle可知，作者徒步穿越奇尔库特小径时，不小心弄伤了自己。

　　答案：　A

　　4．What kind of feeling did the author mainly show in the last paragraph?

　　A．Joy.　　　　　　 B．Pity.

　　C．Worry. D．Doubt.

解析：　推理判断题。作者此次徒步旅行的目的是重走当年克朗代克淘金热时人们走过的路线，对比他到达目的地后乘坐火车、睡在宾馆舒服的床上，当年那些穿越奇尔库特小径的淘金工所经历的艰辛让作者非常同情。