In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

Despite meeting some of the requirements such as being surrounded by a body of water, Australia is commonly cited to be too large to be called a what?, Context: Non-Australian citizens who are Australian permanent residents should be aware that during their stay on Norfolk Island they are "outside of Australia" for the purposes of the Migration Act. This means that not only will they need a still-valid migrant visa or Resident return visa to return from Norfolk Island to the mainland, but also the time spent in Norfolk Island will not be counted for satisfying the residence requirement for obtaining a Resident return visa in the future. On the other hand, as far as Australian nationality law is concerned, Norfolk Island is a part of Australia, and any time spent by an Australian permanent resident on Norfolk Island will count as time spent in Australia for the purpose of applying for Australian citizenship.
Island

What is the second distance given in the text in km, Context: The most dense rail network in Europe of 5,063 km (3,146 mi) carries over 350 million passengers annually. In 2007, each Swiss citizen travelled on average 2,258 km (1,403 mi) by rail, which makes them the keenest rail users. The network is administered mainly by the Federal Railways, except in Graubünden, where the 366 km (227 mi) narrow gauge railway is operated by the Rhaetian Railways and includes some World Heritage lines. The building of new railway base tunnels through the Alps is under way to reduce the time of travel between north and south through the AlpTransit project.
2,258 km

What was Dowding's biggest mistake?, Context: In the inter-war years and after 1940, Hugh Dowding, Air Officer Commanding Fighter Command has received credit for the defence of British air space and the failure of the Luftwaffe to achieve air superiority. However, Dowding had spent so much effort preparing day fighter defences, there was little to prevent the Germans carrying out an alternative strategy by bombing at night. When the Luftwaffe struck at British cities for the first time on 7 September 1940, a number of civic and political leaders were worried by Dowding's apparent lack of reaction to the new crisis.

spent so much effort preparing day fighter defences