A current focus is on the utilization of these technologies for environmentally benign gas and oil well operations.

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问题 A current focus is on the utilization of these technologies for environmentally benign gas and oil well operations.

选项 A、harmless
B、mild
C、renewable
D、compressed

答案A

解析 词义辨析。注意副词和形容词的搭配。根据对环境有重要意义的,排除B、D选项。如果替换部分前没有副词,C选项也可以讲得通。
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