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distances, and may , eventually , even get across the English Channel, it is doub tful whether they will ever cy cle across the Atlantic. Lesson6 7 Volca noes 火山火山 Haroun Tazieff the Polish scientist, has spent his life-time study ing active vo lcanoes and deep caves in all parts of the world. In 1948, he went to la ke Kivu in the Cong o to observe a new volcano wh ich he later named Kituro. Ta zieff was able to set up h is camp very close to the volcano w hile it was erupting violently . Thou gh he managed to ta ke a number of brilliant photo graphs, he could not stay near the volcano for very long. He noticed that a river of liquid roc k was coming towards him. It threatened to surround him completely , but Tazieff managed to escape just in time. He waited until the volcano became quiet and he wa s able to return two day s later. This time, he managed to climb into the mouth of Kituro so that he could ta ke pho tograph s and measure temperatures. Tazieff has often risked his life in this way . He has been able to tell us more about active 火山火山 volcanoes than any man alive. Lesso n68 Persiste nt 纠缠不休纠缠不休 I crossed the street to avoid meeting him, but he saw me and came running towards me. It was no use pretend ing tha t I had not seen him, so I waved to h im. I never enjoy meeting Bert Dy kes. He never has any thing to do. No matter how busy y ou are, he alway s insists on coming with y ou. I had to thin k of a way of preventing him from followin g me around all morning. Hullo, Bert, I sa id. Fancy meeting y ou here ! Hullo, Elizabeth, Bert answered. I was just wondering how to spend the morning--until I saw y ou. Youre not busy doin g any thing, are y ou ? No, not at all, I answered. Im going to.. . Would y ou mind my coming with y ou ? he asked, before I had finished spea king. ‘ No t at all, I