题目内容：

    Wood has many great characteristics that make it the perfect building material. It is cheap, durable(耐用的), easily available, and most importantly, environmentally sustainable. The one thing it is not, is transparent(透明的).Now thanks to a team of scientists at Stockholm’s KTH Royal Institute of Technology, the material may even be able to add that feature to its already impressive list.

Lead researcher Dr. Lars Berglund said he was inspired to create the transparent wood after learning how Japanese researchers had developed a see-through paper for use in flexible display screens for electronic devices.

The team began by pulling out the wood’s lignin (木质素). The lignin-free wood was then dipped into a polymer (聚合物) and baked at a temperature of 158F for four hours. The result was a hybrid product that was not only stronger and lighter than the original wood but also, almost transparent. The researchers were able to adjust the level of transparency by varying the amount of the polymer injected and also by changing the thickness of the wood.

While scientists have previously created a see-through wood for small-scale applications like computer chips, the transparent wood is the first one being considered for large scale applications. The researchers, who revealed their findings in Biomacromolecules on April 11, picture using the transparent wood in buildings to allow for more natural light, or to create windows that let in the desired amount of light without sacrificing privacy.

Wood that allows light to pass through could lead to a brighter future for homes and buildings. Berglund also thinks the wood could play a significant role in the design of solar panels. The semi-transparent material would be able to keep light longer and give it more time to interact with the conductor, thus resulting in better solar efficiency.

Additionally, substituting the currently used glass with this new product would help solar energy manufacturers improve their carbon footprint and lower the cost. They are now experimenting with ways to scale up the manufacturing process so that the transparent material is cost-effective to make and easy to use.

1.What does the underlined part "that feature" in Paragraph 1 refer to?

A.Cheapness. B.Durability.

C.Sustainability. D.Transparency.

2.Which of the following is not the process in which the transparent wood is made?

A.Dip the wood into a polymer. B.Reduce the amount of the polymer.

C.Make the wood lignin-free. D.Bake the wood for some time.

3.What’s the purpose of using the transparent wood in buildings?

A.To protect privacy. B.To scale out applications.

C.To get more natural light. D.To observe more clearly.

4.What is the last paragraph mainly about?

A.The bright future of the transparent wood.

B.The wood’s role in the design of solar panels.

C.The disadvantages of the currently used glass.

D.Solar energy manufacturers’ carbon footprint.