1.wastes lots of electricity
2.show interest in sth.
3.reflect off
4.cover up
5.protect you from hurting your hands
6.The new idea is about fuel cells using chemical reactions to produce electiveity.
7.Now they can make an enzyme last for months instead of days.
8.Windows are the weak link in a building when it comes to energy and temperature control.
9.scientists are now working on "smart windows".
10.The old technology,however,is large ,heavy,and impractical for wide use.
11.This kind of airplane may help people travel in space.
12.The botom of the hill must not be anywhere near cars or roads.