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Scientists have found a way of protecting astronauts from solar radiation.
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A．Their competitors have long been advertising on TV.B．TV commercials are less expensive.C．Advertising in newspapers alone is not sufficient.D．TV commercials attract more investments.
A．Their competitors have long been advertising on TV.
B．TV commercials are less expensive.
C．Advertising in newspapers alone is not sufficient.
D．TV commercials attract more investments.
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