题目内容：

    Since November last year, cyclists in the northern Dutch town, Krommenie, have been part of a revolutionary experiment—a length of 70 meters of the town's main bikeway has been resurfaced with a layer of glass tiles treated with a non-slip coating. The panels, which are laid on a bed of concrete, are only one centimetre thick, but it's what's inside the glass that makes them truly impressive—each individual section contains a solar cell and together they form one long energy producing net work.

There were a number of reasons to start with a bike path. One is that when you start an innovation like this you want a step that is doable, but still guarantees that things are pretty safe for road users. In a bike path, the loads are not too heavy, and the requirements are not too severe. The Krommenie experiment has four goals. One is to see how it performs technically and what the energy production is. The second goal is to know what the satisfaction of the users is; do they have any kind of discomfort or negative perception? And the last thing, is to see if the road managers are comfortable with this type of road which is completely new.

More than 150 ,000 cyclists have used the bike path in the first six months of its operation and the trial has met with no serious problems, even during recent testing using heavyweight vehicles. Some wear and tear on the non-slip coating was expected and has been repaired.

Despite the trial's promise, there is still one major problem to deal with—the initial cost of road construction using the solar panels is higher than it is for standard forms of surfacing. But the researchers predict that will come down, when the technology enters mass production.

1.What does the underlined word " panels" in the first paragraph refer to?

A.Bikeways. B.Glass tiles.

C.Solar cells. D.Non- slip coatings.

2.Why was the experiment started with a bike path?

A.It is very easy to build. B.It is cheap and light.

C.It is frequently used. D.It is workable and safe.

3.What does the author think of the future of solar panel road?

A.Promising. B.Expensive.

C.Unnecessary. D.Impractical.

4.What can we infer about the solar panel road?

A.Its trial was a great success with no problems.

B.It has no limit to the weight of heavy vehicles.

C.It cannot be put into regular use at the moment.

D.Its management will be difficult and expensive.