单项选择题

A．Promoting the sales of something by telephone.
B．Talking with the woman on how. to stay healthy..
C．Discussing with the woman on how to stay fit.
D．Talking with the woman about a fitness program.
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The Internet’s ___________________ programming isn’t suitable for mobile phones.
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To solve the size problem of cell phones, scientists have been researching ___________________ for decades.
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