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In astronomy, Muḥammad ibn Jābir al-Ḥarrānī al-Battānī improved the precision of the measurement of the precession of the Earth's axis. The corrections made to the geocentric model by al-Battani, Averroes, Nasir al-Din al-Tusi, Mu'ayyad al-Din al-'Urdi and Ibn al-Shatir were later incorporated into the Copernican heliocentric model. Heliocentric theories were also discussed by several other Muslim astronomers such as Al-Biruni, Al-Sijzi, Qotb al-Din Shirazi, and Najm al-Dīn al-Qazwīnī al-Kātibī. The astrolabe, though originally developed by the Greeks, was perfected by Islamic astronomers and engineers, and was subsequently brought to Europe.
Who perfected the astrolabe originally developed by Islamic astronomers?
A: unanswerable

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On the other hand, Belgian federalism is federated with three components. An affirmative resolution concerning Brussels' place in the federal system passed in the parliaments of Wallonia and Brussels. These resolutions passed against the desires of Dutch-speaking parties, who are generally in favour of a federal system with two components (i.e. the Dutch and French Communities of Belgium). However, the Flemish representatives in the Parliament of the Brussels Capital-Region voted in favour of the Brussels resolution, with the exception of one party. The chairman of the Walloon Parliament stated on July 17, 2008 that, "Brussels would take an attitude". Brussels' parliament passed the resolution on July 18, 2008:
How many components does the Belgian federalism have? 
A: three components

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By the 12th century, Romanesque architecture (termed Norman architecture in England because of its association with the Norman invasion), was established throughout Europe and provided the basic architectural forms and units that were to remain in evolution throughout the Medieval period. The important categories of building: the cathedral church, the parish church, the monastery, the castle, the palace, the great hall, the gatehouse, the civic building, had been established in the Romanesque period.
What is Romanesque architecture no longer known as in England?
A: unanswerable

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Ratification of the treaty the following year led to resumption of hostilities and in 1860, with Anglo-French forces marching on Beijing, the emperor and his court fled the capital for the imperial hunting lodge at Rehe. Once in Beijing, the Anglo-French forces looted the Old Summer Palace, and in an act of revenge for the arrest of several Englishmen, burnt it to the ground. Prince Gong, a younger half-brother of the emperor, who had been left as his brother's proxy in the capital, was forced to sign the Convention of Beijing. Meanwhile, the humiliated emperor died the following year at Rehe.
What happened to the Old Summer Palace?
A:
burnt it to the ground