单项选择题

A．Running a mile a day.
B．Running twice a week.
C．Running in a six-mile race.
D．Controlling the exercise program.
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E
单项选择题
A．Because it was simple to manufacture.B．Because it would be much easier to sell.C．Because technology made it impossible to make other models.D．Because the cost could then be low enough for people to buy.
A．Because it was simple to manufacture.
B．Because it would be much easier to sell.
C．Because technology made it impossible to make other models.
D．Because the cost could then be low enough for people to buy.
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