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　　北京新航道学校致力于雅思培训为大家提供权威参考资料。暑假已经结束了，赶在这个时间参加雅思的考生朋友们也完成了自己的学习计划，总结这个暑期的阅读试题，我们为大家进行了整理，希望对那些正在准备考试同学有所帮助。雅思阅读对于国内考生来说难度较大，除了专业水平之外，还极度考验着同学的耐心和细心。下面就给大家一些资料，希望对于同学的英语成绩有所帮助。

　　本期为大家整理的阅读试题比较多，一部分练习的题目会跟在下面一篇文章中，请同学们知悉。

　　Where soil conditions are appropriate, GPR can provide the most complete and accurate information about buried structures and utility lines, but requires a carefully laid out survey grid or pattern if the maximum accuracy is to be obtained from the survey profiles. GPR will detect non-magnetic or non-conductive lines such as plastic gas pipes.

　　GPR is not suitable for use in locating objects deeper than about 3 feet or so in moist clay or silty clay soils, but since it is measuring soil dielectric properties, it can give useful information about the lateral extent of disturbed soils or backfill areas, even where a utility line is not identified due to signal attenuation.

　　For reconnaissance-level surveys, where it is required to sweep large areas of open land for buried structures, EM conductivity surveys will be much more economical than GPR, but will provide little or no useful depth information. EM will not directly detect non-conductive material such as plastic gas pipe, but will usually identify the conductivity anomaly caused by the backfill around the pipe.

　　Magnetometer, Gradiometer, and electro-magnetic or RF utility locators are generally best employed for tracing the route of a utility line when a physical connection to the line can be made at one end, or in a manhole or trial pit. The methods will not work with plain plastic pipe such as older gas transmission lines. If the plastic pipe has been installed with marker magnets at the couplers, wire markers, or conductive tape laid in the excavation, then these tools might be considered.

　　In the author’s experience, the most efficient survey program for a location where no accurate utility information is available is to use EM for an initial search, then use GPR to refine the data in areas where EM indicated conductivity anomalies.

　　A magnetic plastic gas pipe has been developed under the auspi

　　ces of the Gas Research Institute, and is currently being evaluated under field conditions. If the durability of the material lives up to expectations, and the cost becomes competitive with current gas line products, location of the new lines will be greatly simplified, and current utility location tools will become much more useful.

　　Choose one phrase (A-M) from the List of phrases to complete each Key point below.

　　The information in the completed sentences should be an accurate summary of the points made by the writer.

　　NB. There are more phrases (A-M) than sentences, so you will not need to use them all. You may use each phrase once only.

　　经过老师课堂经验发现，雅思阅读对考生来说就是不能合理分配阅读题干的时间和答题时间，这还需要同学在平日里多加练习，以便应试速度，老师提醒大家，成绩绝非一朝一夕之事，勤奋练习才能收益。最后祝你考试顺利。

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