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mechanism
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单项选择题
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.
单项选择题
A．Only humans respond to emotions by shedding tears.B．Only humans shed tears to get rid of irritating stuff in their eyes.C．Only human tears can resist the invading bacteria.D．Only human tears can discharge certain chemicals.
A．Only humans respond to emotions by shedding tears.
B．Only humans shed tears to get rid of irritating stuff in their eyes.
C．Only human tears can resist the invading bacteria.
D．Only human tears can discharge certain chemicals.
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