单选题
1.00分
The scientists have conducted a series of experiments.
参考答案: B
参考解析: 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。