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。

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