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 Africa 

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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". 
106- From the figures in the passage, we learn that……. . 
A) there are only about 2,650 known species of plant in the world 
B) about 265,000 of the world's flowering plants can be used as medicine 
C) breakthroughs in technology have diminished the interest in plants with medicinal value 
D) plants that can be used as medicines are worth more than gold 
E) around 25 percent of the world's prescription drugs are plant-based