25. At the end of the cleaning process, the carbon dioxide
A. is released into the air.
B. is disposed of with the waste.
C. is collected ready to be re-used.
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24. In the holding chamber, the carbon dioxide
A. changes back to a gas.
B. dries the dishes
C. is allowed to cool.
23. The stone in John's 'Rockpool' design is used
A. for decoration.
B. to switch it on.
C. to stop water escaping.
22. John chose a dishwasher because he wanted to make dishwashers
A. more appealing.
B. more common.
C. more economical.
21. Students entering the design competition have to
A. produce an energy-efficient design.
B. adapt an existing energy-saving appliance.
C. develop a new use for current technology.
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