Reading passages

103-The passage states that one result of the 
development of agriculture was that ……… .
A) people didn't have to work as hard as they used to 
B) people began to make inventions 
C) there was an improvement in people's diet 
D) nomadism gradually disappeared 
E) people became less savage 
104- It is clear from the passage that…….. .
A) was invented after long periods of hard work 
B) was regarded as too difficult by nomads 
C) was best carried out by the people in Asia and 

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Africa 
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".