41.2 Complete the text about continuously variable transmission using the words in the box. Look at A, B and C opposite to help you. automatic higher ratio shafts transmit helical manual selection shift wheels CONTINUOUSLY VARIABLE TRANSMISSION (CVT) (1) __________ gearboxes allow the driver of a vehicle to (2) __________ gears as required. If a (3) __________ gear is selected, the speed of the output shaft will increase relative to the input shaft, for a given engine speed. In a typical (4) __________ gearbox, however, the gear (5) __________ system is automated, requiring no action by the driver. In addition, most automatic transmission systems use so-called planetary gears. In basic terms, these allow the transmission to remain connected at all times - unlike manual gearboxes, in which pairs of (6) __________ gears are momentarily disconnected each time a shift is made. The principle of continually variable transmission (CVT) is entirely different to both manual and automatic systems. Instead of having a fixed number of different gear (7).. each with different numbers of teeth, CVT uses a special mechanism to continuously and progressively adjust the gear (8) __________ between the input and output (9) __________. Therefore, as the vehicle accelerates or decelerates, continual adjustments are made to the transmission automatically. This allows the engine to be maintained at a constant speed for optimum power and fuel efficiency while the system is able to continuously (10)........... drive to the vehicle's wheels.