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Unit 21 Human Biology L3 课文填空练习
Epidemics _1______________ history
2_________ recent press reports 3________(draw) parallels between bird flu and a killer epidemic in the past, Jim smith looks through the history of epidemics for clues about what the future might hold.
4___________ bird flu first appeared in 1997, it has 5_________(take) more than a hundred lives. Many people fear it could be the next global epidemic, especially as scientists who studied tissue from the bodies of the 1918 Spanish flu proved that bird flu is a modern 6_____________（adapt） of the same virus.
Bacteria and viruses have been 7__________ since the beginning of life on earth and many of today’s diseases have existed as long as humans have. It is important to look 8_________ the spread of diseases throughout history to discover the causes and effects of epidemics, and 9___________(hope), foresee and prevent them in the future.
One of the earliest epidemics 10. _______ record happened about 500-550 AD when the Roman emperor at the time was 11_______(attempt) to rebuild the Roman Empire. This epidemic 12__________(sweep) through North Africa, the Middle East and Europe.
Scientists now guess that up to 50%of the area’s population died 13________ this epidemic 14__________(make) it one of the main causes of the fall of the Roman Empire.
In 15_______ 1330’s, the epidemic returned, this time in Asia. It spread rapidly and became known 16 ________ “the black death” as one symptom was black spots on the body. The conditions in much of Asia and Europe-war, crowded cities and a lack of basic health routines-provided the perfect conditions for the disease to spread worldwide.
In 17 ________(城市) areas all over Europe, Asia, Africa and the Middle East, 18______ to one half of the population was 19_______(lose) to the Black Death.
Another epidemic that spread in similar conditions was the great flu epidemic of 1918, also called the Spanish Flu. It 20__________(strike) near the end of the First World War and left families 21_________(mourn) worldwide.
22______________( kill) up to 50 million people in 18 months, with a 23_________(趋势) to strike the young and fit rather than the old, the Spanish Flu is 24____________(belie
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