题目内容：

    Dutch officials toasted on Tuesday the opening of what is being called the world’s first 3D-printed concrete bridge, which is meant to be used by cyclists. There was applause as officials wearing hard hats and workmen’s jackets rode over the bridge on their bikes at the opening ceremony in the southeastern town of Gemert.

“The bridge is not very big, but it was rolled out by a printer which makes it unique,” Theo Salet, from the Eindhoven University of Technology, told Dutch broadcaster NOS. Work on printing the bridge, which has some 800 layers, took about three months after starting in June and it is made of pre-stressed concrete, according to the university. “One of the advantages of printing a bridge is that much less concrete is needed than in the conventional technique in which a mould (泥浆) is filled,” it said on its website, adding “a printer deposits the concrete only where it is needed.”

The eight-metre (26-foot) bridge crosses a water-filled channel to connect two roads, and it was tested for safety to bear loads of up to two metric tons in cooperation with the BAM Infra Construction company. Although designed for bikes, it could take up to 40 trucks, the designers said “We are looking to the future,” said the head of BAM, Marinus Schimmel. “3D printing meant fewer rare resources were needed and there was significantly less waste,” he added.

The Netherlands is among countries, with the United States and China, taking a lead in the cutting-edge technology of 3D printing, using computers and robotics to construct objects and structures from scratch without using much traditional manpower. Last year a Dutch architect unveiled (提示) a unique 3D printer with which he hopes to construct an “endless loop” building. And a Dutch start-up called MX3D has begun printing a stainless-steel bridge, of which a third is already completed. The aim is to finish printing by March and lay the bridge over an Amsterdam canal in the future.

1.According to the text what makes the bridge unique?

A. It adopts 3D printing

B. It opens only to cyclists.

C. It is made of new material.

D. It uses much less concrete.

2.According to Marinus Schimmel. the bridge ________.

A. fails to bear heavy loads more safely

B. needs no concrete and mould

C. is designed for bikes and trucks

D. is cost-efficient and eco-friendly

3.According to the last paragraph, which of the following statement is true?

A. The 3D-printed bridges are all designed for bikes.

B. 3D-printed construction saves much human labor.

C. United States and China develop slowly in 3D printing.

D. The stainless-steel bridge by MX3D has been put into use.

4.What is the best title for the text?

A. The Value of the 3D Printing Technology

B. The Netherlands Leads the Way in 3D Printing

C. World’s First 3D-printed Bridge Opens to Cyclists

D. 3D Printing is Widely Used in Building Bridges