题目内容：

When Noah Ready-Campbell was a young adult, he worked for his father’s construction company. Back then, he dreamed of a day when robots might take over the dirty, repetitive（重复的）parts of his job, such as earth moving. Years later, Ready-Campbell left his job as an engineer with Google to make that dream come true.

Ready-Campbell formed a company called Built Robotics, which develops technology to produce self-driving heavy equipment. Ready-Campbell says the company’s goal is to make construction safer, faster and less costly. The construction industry struggles to find skilled workers and faces a growing number of unfinished projects. But self-operating machines are changing the nature of building.

Workers at Berich Masonry in Englewood, Colorado, recently spent several weeks learning how to operate a robot called SAM, or the Semi-Automated Mason. SAM is a $400,000 machine from the company Construction Robotics, It can lay 3,000 bricks in eight hours. That’s several times more than a human bricklayer can do in the same period. But humans are still needed to load bricks into the SAM and make sure it works right. Bricklayer Michael Walsh says the SAM lessens the load on his body. But he doesn’t think it will take his job.

Brian Kennedy agrees, too. His organization supports the rights of construction workers in the United States and Canada. Kennedy says the union is not worried that machines will replace human workers any time soon.

The rise of construction robots comes as the building industry faces a severe decrease in labor supply. One recent study showed that 70 percent of construction businesses have a difficult time finding skilled workers. Mike Moy heads a mining operation for the building materials supplier Lehigh Hanson. He says it’s difficult to find people who even know how to operate some of the necessary equipment. “Nobody wants to get their hands dirty any more. They want a nice, clean job in an office,” he noted.

1.What does the first paragraph say about Noah Ready-Campbell?

A. He enjoys doing repetitive work.

B. He is now an employee of Google.

C. He used to work in construction field.

D. He joined Google to realize that dream.

2.Which of the following is one of the aims of Built Robotics?

A. Increasing construction speed.

B. Enlarging construction quantity.

C. Improving construction designs.

D. Changing construction steps.

3.What can be inferred about SAM from the text?

A. It can totally replace human bricklayers.

B. It is complexly built but easy to operate.

C. It is unable to work completely automatically.

D. It is cheap but works much faster than humans.

4.In Mike Moy’s opinion, what prevents many construction businesses from finding skilled workers?

A. Their low pay.    B. Their potential risks.

C. Their heavy work loads.    D. Their poor working conditions.