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D) also helped develop people's way of thinking
E) prevented people from living as freely as before
105-From the information given in the passage, one can conclude that, in Africa and Asia ….. .
A) the nomadic way of life has gained in popularity in the 20th century
B) agriculture started earlier than in other continents
C) nomadism. which
disappeared in ancient times, has been revived in modern times
D) there are still people leading a nomadic way of life
E) nomads can find m6re to eat than settled farmers
Around a quarter of all prescription drugs sold around the world are believed to
be based on
chemicals obtained from only forty plant species. So far, fewer than 1% of the world's 265,000
flowering plants have been tested for their powers to cure. In the past few years, however,
breakthroughs in
computer technology, genetic engineering and other realms of biology have led to a
"gold rush" to the rain forests and mountain ranges of the tropics, home to uncounted plant species.
Here, scientists hope to profit from the traditional knowledge of tribes,
which had previously been
looked down on as "primitive" and "backward".
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