________________

A．It can be performed outside a laboratory.

B．It can now be done more efficiently.

C．It no longer involves radioactive elements.

D．It can be used in fields other than geology.

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参考答案

答案解析

【预测】选项中重复出现的it Can be以及performed，laboratory，fields和geology表明，本题可能考查it的进展情况或变化，it可能指年代测定技术。
【解析】B。录音中教授提到，之前这项技术需要很长时间才能得到测定结果……但技术的进步减少了需要测试的颗粒数量，所以能更快得到结果，即新的测试技术变得比之前更高效，由此可知，测试效率的提高使这项新技术变得更受欢迎，故答案为B。

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C．bad

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G．decreased

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B．aged

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