more recently,landsat 4,a special earth-mapping satellite,aided in the discovery of ancient mayan ruins in mexico.landsat can,with the help of false-color imagery,see through much of the area.armed with these maps,a five-person expedition took to the air in a helicopter.
by the end of the second day,the team found a stretch of walled fields that expedition members said look like old new england fences.they just go on,non-stop,for 40 miles.later in the week,an ancient village was pinpointed,as was the lost city of oxpemul,once found in the early 1930s but quickly reclaimed by the jungle.the findings made them able to map the extent of the mayan civilization in about five days.working on foot,it would have taken at least 100 years.
练习:
1.with the help of the space-shuttle-carrieD.radar, archeologists found
A.A.new stretch of the saharA.desert.
B.traces of ancient riverbeds under the saharA.desert.
C.some traditional archeological tools in the saharA.desert.
D.A.mountain beneath the saharA.desert.
2.which of the following is true of the sand-burieD.landscape?
A.it was an olD.avenue,
B.it was an undergrounD.river.
C.it was shapeD.by flowing water.
D.it was shapeD.by the olD.nile river.
3.the stream-roundeD.pebbles anD.stone-age axes which were founD.along the ancient river banks show that
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