Swimmers must be very strong in order to build up speed because of the high resistance (阻力)of the water. Runners,__________, must struggle against the heavy resistance of the air and ground.
| A．generally |
| B．similarly |
| C．naturally |
| D．probably |
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Swimmers must be very strong in order to build up speed because of the high resistance (阻力)of the water. Runners,__________, must struggle against the heavy resistance of the air and ground.
| A．generally |
| B．similarly |
| C．naturally |
| D．probably |
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