most→more
higher→taller
more→larger
few→fewer
Ⅲ.语法填空 Scientists believe the Sahara Desert is ________ (two) as old as we previously thought. Science books generally say the Sahara is around three million years old. _______________, a new study from a center for climate research in Norway says it could be around seven million years old. Researchers _________ (use) computers to calculate when large parts of North Africa became desert. Their tests showed that __________ (globe) warming seven million years ago dried a lot of the land in ________ is today the African nation of Chad. A sea _________ (call) the Tethys Sea started shrinking. This made the African summer monsoons(季风) less frequent, ________ helped form sand dunes(沙丘) in Chad. However
twice
which
used
global
what
called
The Sahara is one of the world's best-known and ________ (large) deserts. The sands stretch from the Atlantic Ocean in the west to the Red Sea in the east. Not everyone agrees that the Sahara is ______ old as the Norway research says it is. Stefan Kropelin, a geologist in Germany, says real geological evidence is needed to be sure. He says the Norway research is based on numbers but not evidence. He adds that our knowledge of the Saharan climate is _______ (little) than we thought. As time goes by, the mystery of the Sahara Desert could be explored. less
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