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The government is reviewing the demands, a spokesman has said.
On Wednesday, US Secretary of State Rex Tillerson had asked the four countries to make their demands "reasonable and actionable".
However, Qatari Foreign Minister Sheikh Mohammed bin Abdulrahman al-Thani, quoted by Al-Jazeera, said: "The US secretary of state recently called upon the blockading nations to produce a list of grievances that was 'reasonable and actionable'.
"The British foreign secretary asked that the demands be 'measured and realistic.' This list does not satisfy that [sic] criteria."
He said the demands were proof that the sanctions had "nothing to do with combating terrorism... [but] limiting Qatar's sovereignty, and outsourcing our foreign policy".
In a statement, Al Jazeera said: "We assert our right to practise our journalism professionally without bowing to pressure from any government or authority."
What effect are sanctions having?
Qatar's main import routes - by land from Saudi Arabia and by sea from container ships docked in the UAE - have been disrupted and much of the surrounding airspace has been closed to its air traffic.
However, the small but wealthy country has so far avoided economic collapse by finding alternative routes.
Qatari citizens living in neighbouring countries or with family living there have been hit harder, Reuters news agency notes, because of ultimatums issued for them to leave.
Where is the US in this?
Correspondents say there has been frustration in Washington over the time taken by the Saudis and others to formalise their demands.
US President Donald Trump has taken a hard line towards Qatar, accusing it of being a "high-level" sponsor of terrorism.
However, the Arab states involved in the crisis are all close allies of the US while the largest US base in the Middle East is in Qatar.