Why does the author say solar water heaters would become immensely popular if their prices dropped down?
举一反三
- The solar water heater would become immensely popular if their prices dropped down, because they would help 1 lower 2 and at the same time cut 3 .
- Solar water heaters would be immesely ______ since it would help dramatically lower our energy costs.
- Why does the author say "Who knows how famous YOU might become!" at the end of the text?
- Why is it so rare to see rooftop solar water heaters in America while such devices are commonplace in China?
- Currently there are ______ rooftop solar water heaters in China.