2. Smallpox has been prevented from spreading through the following measures EXCEPT that ______.
A. most people were vaccinated against the disease at least once
B. people going abroad should promise not to spread the disease
C. people travelling from one country to another must prove they are vaccinated
D. people must be vaccinated shortly before going to foreign countries
3. What led Dr Jenner to experiment with vaccination was that______.
A. he wanted to make a great discovery and publish it
B. vaccination could make people's arms safe
C. he tried to cure the farmers of some disease caught from the cattle
D. those who worked with cattle seemed tree from getting smallpox
4. The doctor's new discovery was called 'vaccination' for the reason that ______.
A. he discovered smallpox near a farm
B. he experimented with a disease from the cattle
C. he was working with cattle in the countryside
D. people got the disease of smallpox from the cattle
5. The news of the discovery ______.
A. caught people's attention from all corners of the world
B. spread far and near in the western countries
C. made people rush to Dr Jenner for vaccination
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