做雅思阅读，记雅思单词：MultipleChoiceQuestion

　　通过快速浏览，我们找到了原句：Utility companies, construction projects, and highway contractors are often faced with the need to excavate or pipe-jack in the vicinity of known or suspected buried utility lines, drains, or other subsurface structures.
　　根据这一句的意思，我们发现选项D‘often need to dig holes near some subsurface structures’与原文的意思相符。这是因为，我们可以从原句中找到 need, excavate(dig), in the vicinity of (near), subsurface structures。这几个词事实上就是这个句子的主干部分，并且这也与备选句的意思相同，因此应该选D。而选项A虽然也合乎情理，但在文中没有出现，所以只是干扰项，不能选作答案。
　　Q2.Trial pits...
　　同样，我们发现原句是：One way to verify the location of such buried objects is to cautiously dig a trial pit to expose the object in question.
　　读完‘Trial pits’所在的这个句子，我们发现选项B与F都与原句的意思相近。那到底应该选哪一个呢？通过分析可以发现，dig trial pits 的目的并不是 expose the object，而是 verify the location of the buried objects。因此，F才是正确的选项。
　　Q3. Mechanical digging equipment...
　　原句：Where mechanical digging equipment is used, an undocumented or misaligned utility line can be easily be damaged if it is not observed by the excavation workers. Gas and electricity lines present very obvious safety threats in this situation.
　　从Mechanical digging equipment’所在的句子我们可以看到这样几个词：undocumented, utility line, easily be damaged.。把这几个词连成句子后恰好和备选项C‘damages easily undocumented utility lines’意思一样。但能否就贸然选C呢？仔细阅读原句可以发现，damage easily the undocumented utility line 是在没有被 excavation workers 发现的情况下，因此可以说是受这一条件限定。如果选C，就以偏概全，把特定情况下发生的问题说成了总的经常性的问题。自然，C不能选择。
　　Q4. Geophysical survey method...
　　原句：There are several geophysical techniques with proven capabilities in non-intrusive subsurface investigation....
　　The real driving force behind the development of geophysical survey methods was the search for oil and other valuable mineral deposits.
　　做这个题时，首先要细心，不要把 'geophysical techniques' 和'geophysical survey methods'混淆起来，要准确找到需要的词语。在原文句子中，我们看到象 development, search for, oil, valuable mineral deposits这样的词，它们的意思与备选句‘are developed to search valuable mineral deposits’几乎是完全相同，因此，答案应当是E。
　　Q5.GPR...
　　原句：a. 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....
　　b. GPR will detect non-magnetic or non-conductive lines such as plastic gas pipes.
　　该题同第三题，应注意 where soil conditions are appropriate属于限定性条件，因此不能选H选项。
　　Q6. EM conductivity survey...
　　原句：EM conductivity surveys will be much more economical than GPR, but will provide little or no useful depth information.
　　在EM conductivity survey 所在的句子中有provide little or no useful depth information 这样的词句，这与选项中‘provides little useful depth information’几乎一样，因此，答案应该为G。
　　Q7. The development of a magnetic plastic gas pipe...
　　原句：A magnetic plastic gas pipe has been developed under the auspices 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....
　　在这道题中，我们看到，‘The development of a magnetic plastic gas pipe ’所在的句子中没有与选项意思相近或相符的词句，而这个句子又是唯一的一个含有该短语的句子。这时候，我们就要继续看下一个句子，看这个句子逐渐展开后的意思。果然，我们看到有location of the new lines will be greatly simplified，与选项‘is likely to make it easier to locate the lines’意义相符。这样答案就找到了。