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Scientists traced significant air pollution back to China even though ----

A- air pollution from U.S. sources was rapidly increasing at the same time

B- the data they used came from 2006, when air pollution was less than today

C-they were denied access to many of their planned study sites

Sagot :

Evangelaf16660idn

Answer:

A

Explanation:

They found that, especially in Western U.S. states, significant amounts of the air pollution present could be traced to China. This was true!

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