This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

[EX Q]: Providing 25% of Namibia's revenue, mining is the single most important contributor to the economy. Namibia is the fourth largest exporter of non-fuel minerals in Africa and the world's fourth largest producer of uranium. There has been significant investment in uranium mining and Namibia is set to become the largest exporter of uranium by 2015. Rich alluvial diamond deposits make Namibia a primary source for gem-quality diamonds. While Namibia is known predominantly for its gem diamond and uranium deposits, a number of other minerals are extracted industrially such as lead, tungsten, gold, tin, fluorspar, manganese, marble, copper and zinc. There are offshore gas deposits in the Atlantic Ocean that are planned to be extracted in the future. According to "The Diamond Investigation", a book about the global diamond market, from 1978, De Beers, the largest diamond company, bought most of the Namibian diamonds, and would continue to do so, because "whatever government eventually comes to power they will need this revenue to survive".
[EX A]: How much revenue does mining provide Namibia?

[EX Q]: While there is typically only one conceptual (or logical) and physical (or internal) view of the data, there can be any number of different external views. This allows users to see database information in a more business-related way rather than from a technical, processing viewpoint. For example, a financial department of a company needs the payment details of all employees as part of the company's expenses, but does not need details about employees that are the interest of the human resources department. Thus different departments need different views of the company's database.
[EX A]: How many conceptual or physical views of data are there?

[EX Q]: All the incidental music for the 2005 revived series has been composed by Murray Gold and Ben Foster and has been performed by the BBC National Orchestra of Wales from the 2005 Christmas episode "The Christmas Invasion" onwards. A concert featuring the orchestra performing music from the first two series took place on 19 November 2006 to raise money for Children in Need. David Tennant hosted the event, introducing the different sections of the concert. Murray Gold and Russell T Davies answered questions during the interval and Daleks and Cybermen appeared whilst music from their stories was played. The concert aired on BBCi on Christmas Day 2006. A Doctor Who Prom was celebrated on 27 July 2008 in the Royal Albert Hall as part of the annual BBC Proms. The BBC Philharmonic and the London Philharmonic Choir performed Murray Gold's compositions for the series, conducted by Ben Foster, as well as a selection of classics based on the theme of space and time. The event was presented by Freema Agyeman and guest-presented by various other stars of the show with numerous monsters participating in the proceedings. It also featured the specially filmed mini-episode "Music of the Spheres", written by Russell T Davies and starring David Tennant.
[EX A]:
Who has performed all the Doctor Who music since the 2005 Christmas special?