A．overuse face masks B．deal with the mask problem seriously C．rub
their faces and noses in the subway D．protest against the mask
guidelines E. help protect people from being attacked by a flu F. announce
the results of their mask research
填空题
The scientists are trying to find out if masks may or may not 1.
填空题
The CDC is afraid that the public may 1.
填空题
The public will not know the answer about masks until scientists 1.
填空题
We can infer from the passage that the US authorities 1.