六级近似词辨析 ... rigorous adj．（性格等）严格的；严厉的；苛刻的 vigorous adj．精力充沛的；有活力的；茂盛的 Quality control personnel subjected the new products to rigorous testing．质检人员对新产品的质量严格把关。 ...
Vodafone is also running several pilots, says Richard Saggers, the head of its mobile advertising unit, in which subscribers receive free content in exchange for viewing ads.