2. 外语
  3. A、the sample was favorable for their test B、the sample made the test more difficult C、the sample brought about little benefits D

A、the sample was favorable for their test B、the sample made the test more difficult C、the sample brought about little benefits D

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问题
选项 A、the sample was favorable for their test
B、the sample made the test more difficult
C、the sample brought about little benefits
D、the sample produced unexpected results
答案A
解析 从第6段第2句中的ideal和最后一句中的tens of thousands of times more DNA等可知研究人员认为格陵兰岛的样本对他们的研究带来非常积极的帮助，因此，本题应选A。
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大学英语六级

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