语篇解读：本文是一篇记叙文。加拿大的班夫国家公园里有不少野生动物通道，这有效地保护了野生动物们的安全。

　　4．What was the problem facing Banff National Park?

　　A．Too many people went to visit the park.

　　B．Highway cars took many animals' lives.

　　C．Visitors were often hurt by wild animals.

　　D．Some animals were in danger of dying out.

　　解析：选B　细节理解题。由第一段中的"That's why roadkill ... was a common sight"可知，班夫国家公园里的动物以前常被过往的车辆撞死，故选B项。

　　5．According to the text, the author might be ________.

　　A．a visitor to Banff National Park

　　B．a tourist traveling across Alberta

　　C．an ecologist working for Parks Canada

　　D．a designer for the Trans­Canada Highway

　　解析：选A　推理判断题。由第三段中的"as a tourist I was lucky to be allowed to see Banff's Red Earth Overpass"可知，作者可能是来班夫国家公园参观的游客，故选A项。

　　6．Labib Salama worries that some animals may ________.

　　A．fall off the bridges

　　B．be killed by passing cars

　　C．refuse to use the tunnels

　　D．be eaten by others easily

　　解析：选D　细节理解题。由第四段中的"They probably become easy meals for their natural enemies"可知，D项说法正确。

　　7．What does the author think of the wildlife crossings in Banff?

　　A．They've made it easier for visitors to walk around.

　　B．They've destroyed the environment in the park.

　　C．It is a waste of money to build them.

　　D．It is a good way to protect animals.

解析：选D　推理判断题。由最后一段中的"all these animal tracks made me so happy, knowing that they were passing safely"可知，作者认为这些通道很好地起到了保护动物的