对应原文文本：

Now from a business standpoint, infrastructure purchases can be great investments. If a company buys or gets a long-term lease on a toll bridge from the government, it’s got an almost guaranteed steady source of revenue for years and years. Which means that if a company decides it wants to sell the bridge to another company, say, ten years from now, it’ll have no problem finding a buyer.

Q6. According to the professor, what is likely to happen when a bridge provides steady revenue for a private company?

A.The bridge will be well maintained in the long term.

B.The company will not raise tolls.

C.Other companies will be interested in buying the bridge.

D.Voters will pressure the government to buy back the bridge.

对应原文文本：

Back then, the artists made their own glass, but first they came up with the design. Paper was scarce and expensive, so typically they drew the design onto a white tabletop. They’d draw the principal outline but also outline the shape of each piece of glass to be used and indicate its color.

Q3. During the Middle Ages, what was one of the first steps that artists used in making a stained-glass window?

A.They draw the design onto the top of a table

B.They created models of the design with lead strips

C.They draw an outline of the design directly onto a piece of glass

D.They painted the design on paper.