1 . When it comes to keeping buildings energy efficient, windows certainly pose a challenge. It was with this problem in mind that a British scientist has created a new type of window—one that’s filled with water.

In terms of conventional windows, most of them allow heat to escape during cold weather, causing the building’s boiler to run more frequently. Besides, they allow sunlight to stream in during hot weather, creating heat that causes the air conditioning to kick in. Dr. Matyas Gutai, a lecturer in architecture at Loughborough University, believes that his “water-filled glass (WFG)” windows may address these limitations.

Each window contains a vertical sheet of water, sealed between two sheets of glass. As sunlight passes through the glass, it heats the water, thus keeping the room itself from getting as hot as it would otherwise. Once it reaches a high enough temperature, that sun-warmed water is pumped out of the window, traveling through pipes in the wall to a storage tank elsewhere in the building. Cooler water is simultaneously (同时地) pumped into the WFG to replace what was pumped out. When the outdoor temperature drops later on, the stored warm water is pumped back out of the tank and into the pipes, warming the room by radiating heat through the walls. Alternatively, it can also be used in the building’s taps, reducing the need to run the water heater.

Although some electricity is required to pump the water back and forth, Gutai claims that his setup still uses substantially less electricity than the heating system and air conditioners that would be required to maintain the same room temperatures under the same condition. In fact, it is estimated that a WFG-equipped building would use up to 72 percent less energy that a similar building equipped with double-glass windows and traditional heating systems.

“WFG turns glass into an opportunity for sustainable construction. It shows us that thinking holistically (整体地) and building components leads to a more efficient and sustainable build environment,” says Gutai.

1. What does paragraph 2 mainly talk about?

A．The creation of WFG windows.

B．The functions of WFG windows.

C．The advantages of newly-created windows.

D．The disadvantages of traditional windows.

2. How does WFG react to cold weather?

A．It stores sun-warmed water in a tank.

B．It pumps water out to prevent it freezing.

C．It pumps sun-warmed water from a storage tank.

D．It prevents cold water travelling through pipes.

3. What does the underlined word “it” in paragraph 3 refer to?

A．Warm water in the tank.	B．Cool water in the pipes.
C．Water in the water heater.	D．Water in the sealed glass.

4. What advantage does WFG have over the heating and cooling system?

A．It costs less to set up.	B．It is more power-saving.
C．It is easier to operate.	D．It is steadier in keeping temperature.

2 . What is the change to the house?

A．The guest room is bigger.

B．There’s more space in the living room.

C．The wall in the bathroom was knocked down.