单项选择题

According to this news item, experts are concerned about the following aspects EXCEPT ______.

A. population growth.
B. food resources.
C. water pollution.
D. water resources.
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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
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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