4 . 课文语法填空
Epidemics caused by several different factors, have been happening for as long 1 there have been people living on Earth. Each disease can only officially 2 (classify) as an epidemic when it causes a certain number of deaths.
Jim Smith who tried to compare the bird flu epidemic occurring in 1997 3 other deadly epidemics in our history conducted a study. He found one of the earliest epidemics on record happened between about 500 and 550 CE. Up to 50% of the area’s population died from the epidemic, 4 returned in the 1330s in Asia, known as “The Black Death”, spreading rapidly to Europe.
The Great Flu Epidemic also known as the Spanish Flu, which is believed 5 (be) the most severe epidemic in history, broke out in 1918, just near the end of World War Ⅰ, 6 (kill) up to 50 million people. The SARS epidemic lasting from 2002 to 2003 initially 7 (appear) in Guangdong Province, spread to Canada, Vietnam and Singapore and infected about 8, 000 people. 8 according to official records the Ebola Virus Disease (EVD) killed 11, 310 people in West African countries only, the actual number of deaths is probably much higher. The virus was extremely 9 (infect) and the survival rate was very low in some areas.
Faced with the epidemics, governments are 10 (globe) working together to make medical research, coming up with cures and saving lives.