单项选择题

The following can be bought online EXCEPT ______.

A. the paper products
B. the cleaning products
C. the cereals

D. the meats
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单项选择题
How does the new vaccine work
A. By activating an immune response.
B. By selecting one or two genes.
C. By awaking the entire parasite.
D. By deactivating the entire parasite.
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