【简答题】Electricity, like clean water, is a resource that’s often taken for granted. But last summer, when blackouts struck much of the northeastern US, Ontario and Rome, consumers on two continents were give...
【简答题】E Windows not only let light in to cut down an electricity use for lighting, but the light coming through the window also provides heat. However, windows are not something people typically associate w...
【单选题】Smart Window Windows not only let light in to cut down an electricity use for lighting, but the light coming through the window also provides heat. However, windows are not something people typically ...
A.
Windows can change from clear to dark to save energy.
B.
Windows help to save energy by letting light in.
C.
Windows help to save energy by providing heat.
D.
Windows enable people to have contact with the outside world.
【简答题】1 New technology often creates unanticipated problems. 2 A utomobiles, for example, provide numerous benefits, but they also pollute the air and kill about fifty thousand Americans each year. 3 It is ...