44. A. at B. to C. for D. in
Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate
the correct answer to each of the questions.
Pandemic (dịch bệnh)
Diseases are a natural part of life on Earth. If there were no diseases, the population would grow too
quickly, and there would not be enough food or other resources. So in a way, diseases are nature's
way of keeping the Earth in balance. But sometimes they spread very quickly and kill large
numbers of people. For example, in 1918, an outbreak of the flu spread across the world, killing
over 25 million people in only six months. Such terrible outbreaks of a disease are called
pandemics.
Pandemics happen when a disease changes in a way that our bodies are not prepared to fight. In
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