The scientists have conducted a series of exp
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The scientists have conducted a series of experiments.
A:actions B:tests C:effects D:technologies
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答案：B
科学家们已经进行了一系列的实验。action“行动，活动”，如：The government is taking actions to deal with a housing crisis．政府正在采取行动解决住房危机。test“试验”，如：I try to finish the test within ten minutes．我试图在10分钟之内完成这项试验。 effect “影响”，如：The sunshine has many effects on the skin．阳光对皮肤有很多种影响。technology “技术”，如：Science and technology are the primary productive force．科学技术是第一生产力。只有tests意思上和experiments最接近。