题目内容：

University graduates Mallorie Brodie and Lauren Hasegawa, who invented a smartphone app that tracks construction defects for commercial builders, had a tiger by the tail.

Bridgit, which they founded in 2012, launched a cloud-based communications platform that helped manage defects on construction sites, which can delay projects and result in costly repairs if left unchecked. The smartphone application lets site supervisors take photos of cracks or damaged paint, share them with employees and track the problems to solution.

More than 600 subcontractors used the pilot version in many building sites before the commercial version, called Closeout, officially launched.

Feedback(反馈)was so good that they began to wonder: Why limit their invention to a specific industry? Why not turn it into some kind of a handy tool for consumers too? This became their dilemma. In other words, should they stay the course or look for wider applications of their app?

The experts polled all agreed Bridgit should stay focused on its original goal. Ms. Hasegawa and Ms. Brodie took that advice.

As more business customers signed on, it became clear that they made the right decision. Since then, the company’s growth has been rapid.

Earlier this year, Bridgit launched Closeout, which is designed so that even the least tech-savvy can use it easily. Today, the app is being used on sites across Canada and the United States and even by top general contractors.

In October, Bridgit was named to the Canadian Innovation Exchange’s top 20 list of Canada’s most innovative (创新的) companies working in digital media and information and communication technology .

But Ms. Hasegawa and Ms. Brodie are not resting on their glories. They have also been collecting feedback on Closeout from customers, and they’ll launch a new version in the spring. It will target not only general contractors but developers and building owners, too.

1.What does the underlined word ＂defects＂ in Paragraph 1 probably mean?

A. Style.    B. Process.

C. Drawback.    D. Material.

2.What did the two graduates decide to do when the pilot version was well received?

A. Turn to the ordinary consumer market.

B. Look for wider applications of their app.

C. Turn it into a widely-used tool for consumers.

D. Continue centering on the development in construction industry.

3.Who could be their potential customers?

A. Smartphone users.    B. Architects.

C. Computer programmers.    D. Photographers.

4.Which of the following might be the best title?

A. Graduates’ smartphone application takes off

B. Graduates’ smartphone application has a bright future

C. Graduates’ smartphone application meets with challenges

D. Graduates’ smartphone application plays an important role in our life