Which of the following planets is NOT mentioned（）

单项选择题Spaceships of the future will be （）

A．faster and lighter
B．more convenient and comfortable
C．bigger and lighter
D．quicker and larger

单项选择题Who benefited the least from fridges according to the author（）

A．Inventors.
B．Consumers.
C．Manufacturers.
D．Traveling salesmen.