5．The following conversation is between Susan Russell-Robinson from the US Geological（地质学的）Survey and Barbara Reynolds from USA Today．
Q：Why，after 600 years of no activity，did Mount Pinatubo in Philippines erupt（喷发）in 1991？
A：Volcanoes（火山）each have their own eruption styles．This volcano probably has a rule which makes it erupt in the order of every 500 to 1000 years，but a volcano in Hawaii seems to erupt every year，and some of the Alaskan volcanoes might erupt every 10 or 20 years．
Q：So nothing caused it？
A：There's nothing out of the ordinary．If you were to take an ordinary calendar year，50to 75or 80volcanoes erupt around the world every year．There are 20 to 30 volcanoes every month that show signs of unrest．That might be a full-blown eruption or a whole host of activities like that．
Q：What is"the ring of fire"？
A：If you look at where active volcanoes are placed around the world，there are somewhere between 500and 600 of them．There is what appears to be almost a necklace that goes around the Pacific Ocean．It makes a ring where 60% of the world's volcanoes lie．
Q：Why such a concentration（集中）there？
A：That's based on a theory that the oceans and the continents（大陆） are like separate pieces．When they move，one might ride up over the other one．In this case，the Pacific Ocean goes under the continents and when that happens it seems to produce magma（熔岩）at depth and then you have volcanoes in the same ring．
21．What kind of writing do you think this passage is？B
A．A text taken from a geography book．
B．An interview published in the press．
C．A conversation carried out in a film．
D．An oral test recorded as an example．
22．Which of the following statements can correctly explain why we have so many volcanoes around the Pacific Ocean？A
A．The movement of the surface of the earth makes it possible．
B．The Pacific Ocean produces magma and presses it everywhere．
C．The oceans and the continents are separated from each other．
D．The earth's surface around the Pacific is thinner than any other part．
23．Barbara Reynolds'main purpose here isD．
A．to show how dangerous volcanoes are to the world
B．to learn what signs a volcano gives us before its eruption
C．to warn the world of the existence of"the ring of fire"
D．to introduce some general idea of volcanoes to the public
24．Which of the following can be considered as the best conclusion of the conversation？C
A．There are so many volcanoes in the world and we are always in danger．
B．Volcanoes have erupted more frequently than ever before．
C．Volcanoes are waiting to be better known．
D．Something must be done to protect the people near the ring of fire．
分析 本文是一篇广告布告类阅读，属于采访，主要讲述了来自美国地质学调查局的Susan Russell-Robinson和"今日美国"的Barbara Reynolds关于火山有关知识的对话．
解答 21．B．推理判断题．根据第一句话：The following conversation is between Susan Russell-Robinson from the US Geological （地质学的）Survey and Barbara Reynolds from USA Today．可知，本文是一段采访．故选B．
22．A．细节理解题．最后一个问题是：为什么火山这么的聚集：答案是：When continents and when that happens it seems to produce magma（熔岩）at depth and then you have volcanoes in the same ring．可知，当大陆出现的时候，它在深处产生熔岩，然后在同一个环中产生火山．故可推知，太平洋周围有许多火山是因为地球表面的运动使其成为可能．故选A．
23．D．细节理解题．根据全文内容可知，Barbara Reynolds在采访中主要介绍了些火山知识．故选D．
24．C．推理判断题．从整个采访的内容可知人们对火山还不了解，还有很多知识要了解．故选C．
点评 本文是一篇广告布告类阅读，题目涉及多道主旨大意题，细节理解题，推理判断题．做题时学生应仔细阅读原文，把握文章主要内容，联系文章上下文内容并结合所给选项含义，从中选出正确答案，一定要做到有理有据，切忌胡乱猜测．
