The need for workers is particularly pressing in Western Australia．The mining state’s unemployment rate was 4．5% in November, below the national average of 5．2%．Drivers of heavy trucks can pull in six-figure salaries while experienced crane（起重机） operators can earn hundreds of thousands a year．Attracting skilled workers is a shift for Australia, which historically sent many of its most highly educated to the U．S．and Europe, according to migration data．

　　63．_____, a growing number of Americans go to work in Australia．

　　A．As a result of the encouragement of Australia

　　B．As a result of high unemployment in the U．S．

　　C．Out of their ambition of finding valuable resources

　　D．Out of their determination to realize their dreams

　　64．It can be inferred from the passage that 457 work visas are _____．

　　A．for skilled workers in some fields B．for students on the building project

　　C．especially for American workers

　　D．especially for those out of work

　　65．It is implied in the passage that _____．

　　A．foreigners have to give up their original professional jobs when working in Australia

　　B．it is possible for foreigners to earn more money in Australia than in their own countries

　　C．there are more U．S．citizens hoping to work in Australia than from other countries

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