[解析]
(1)细节理解题。根据第一段The areas of the map where earthquakes are most likely to occur are called earthquake belts.(地图上最容易发生地震的区域被称为地震带。)可知,地震带即地震发生概率高的地区。故选B。
(2)细节理解题。根据第四段To answer the first question,scientists are looking very closely at the most active fault (断层) systems in the country,such as the San Andreas fault in California.(为了回答第一个问题,科学家们正在密切关注美国最活跃的断层系统,比如加州的圣安德烈亚斯断层。)可知,圣安德烈亚斯断层是美国最活跃的断层系统。故选A。
(3)推理判断题。根据倒数第二段Here water was put into a layer of rocks 4,000 metres below the surface of the ground.Shortly after this injection(注射) of water,there was a small number of earthquakes.Scientists have decided that the water which was injected into the rocks worked like oil on each other.(在这里,水被注入地表以下4000米的岩层中。在注入水之后不久,就发生了几次地震。科学家们认为注入岩石中的水像油一样相互作用。)最后一段They have suggested that it might be possible to use this knowledge to prevent very big,dangerous earthquakes,that is,scientists could inject some kind of fluid like water into faults and change on a big earthquake into a number of small,harmless earthquakes.(他们提出,利用这些知识来预防非常大的、危险的地震是有可能的,也就是说,科学家们可以向断层注入某种像水一样的流体,把一次大地震变成一些小的、无害的地震。)可知,科学家们认为大地震危害大,通过注入水等流体,把大地震弱化到小的、无害的地震,就可以减少大地震带来的损失。D.Harmful earthquakes could be prevented by causing harmless earthquakes.(可以通过引发无害的地震来预防有害的地震。)符合文意,故选D。
(4)推理判断题。根据最后一段Scientists are still experimenting at the site of these earthquakes.They have realized that there is a connection between the injection of the water and the earthquake activity.They have suggested that it might be possible to use this knowledge to prevent very big,dangerous earthquakes,that is,scientists could inject some kind of fluid like water into faults and change on a big earthquake into a number of small,harmless earthquakes.(科学家们仍在这些地震发生地进行实验。他们已经认识到注水和地震活动之间有一种联系。他们提出,也许可以利用这些知识来防止非常大的、危险的地震,也就是说,科学家可以向断层中注入某种液体,比如水,然后在大地震发生时变成一些小的、无害的地震。)可知,文中提及的实验,可能在防震方面可能具有实用价值。B.They may have practical value in earthquake prevention.(它们在防震方面可能具有实用价值。)符合文意,故选B。