JINAN, China — Fallen Chinese political star Bo Xilai has launched an unexpectedly spirited defense at his corruption trial, fiercely denying he took $3.5 million in bribes from two businessmen and cross-examining one of them with a lawyer's precision.

Bo's performance Thursday, the first day of the trial, appeared to be a last-ditch effort by the disgraced politician to repair his carefully cultivated reputation as a man of the people.

China's Communist Party mouthpiece blasted Bo's defense in a retort Friday, saying he had "quibbled strongly, was evasive and almost completely denied" his crimes. "No matter how Bo performs, how he lies, it is all only a display of strength to hide the weakness inside," the People's Daily said in a commentary.

Bo is accused of corruption and interference in the investigation of his wife's murder of a British businessman. Prosecutors on Thursday ended months of suspense about details of the bribery charges against him, rolling out accusations that featured a villa in France, a hot-air balloon project and a football club and illustrated how colorful corruption can be in China. The trial resumed Friday, and the second day of proceeding was expected to delve further into the bribery allegations before moving on to charges of embezzlement of government funds and abuse of office.

Bo's verbal sparring Thursday displayed the media-savvy politician's keen sense of how to portray himself well in tough situations. He thanked the judge for letting him speak, asserted that he was pressured into making a confession and was selectively contrite.

"I'm not a perfect man, and not a strong-willed person, I'm willing to take responsibility for that," Bo said. "But as to the basic facts of whether I am guilty or innocent, I must say my piece."

Once the powerful party boss in the megacity of Chongqing, the charismatic Bo fell into disgrace early last year following revelations that his wife had killed British businessman Neil Heywood, and that he had allegedly interfered in the probe. The opening day of the trial on Thursday marked the first time he was seen in public in 18 months, since shortly after the scandal emerged.

In photos and state TV footage from the court, Bo was shown standing in the dock wearing a white long-sleeved dress shirt and dark slacks. His hair was gray and cut short, and he later slumped in a chair with little expression on his face.

The trial is widely presumed to have a predetermined outcome: conviction. But in an unusual display of openness for a major political trial in China, court officials released frequent microblog updates on the testimony, suggesting ruling Communist Party officials are confident of minimizing damage from a scandal that exposed a murder and machinations among China's elite.

Prosecutors said Bo used his wife, Gu Kailai, and his son, Bo Guagua, as intermediaries in accepting $3.5 million in the northeast city of Dalian, where Bo Xilai once held key posts. They also alleged that Bo instructed an underling to keep quiet an $800,000 payment to the city, and that Bo diverted the money into personal funds with the help of his wife, according to updates on the microblog site Sina Weibo posted by the Jinan Intermediate People's Court.

In response, Bo said he had been pressured into falsely confessing to party investigators that he had taken payments from a general manager of a company owned by the Dalian government, although he also said the investigators had treated him well.

"I once admitted this matter against my will," Bo said. "However, at the time, I had absolutely no knowledge of the nature of the matter. My mind was a total blank."

Prosecutors also said Bo helped a Dalian businessman, Xu Ming, in efforts to buy a football club and obtain land for a hot-air balloon project without proper procedures. They said Xu helped Bo's family finance the purchase of a villa in Nice, France, and that Xu bought a Segway, an electric stand-up scooter, for Bo's son. Bo denied the accusations and said the two were not even friends.

Bo also cross-examined Xu, forcing him to repeatedly concede that he had not directly raised such matters with Bo.

Prosecutors presented written testimony from Bo's wife that said the couple kept safes in their various homes across China in which piles of cash were stashed, but Bo raised doubts about her account.

Calling her testimony "comical, very funny," Bo also questioned Gu's suitability as a witness, saying she was a convicted killer with a history of mental illness. But in further questions he chose more gentle words in describing his wife as "a person of culture and taste, a woman of modern thinking."

The prosecution said the confession obtained from Bo was valid and defended the testimony provided by Gu and Xu.

In denying the corruption charges, Bo seemed to be using the trial to make a final stab at ameliorating the damage the scandal has done to his image, which he honed in Chongqing with an anti-crime crackdown that gave him nationwide fame.

During Thursday's session, which lasted about eight hours, some of Bo's supporters gathered outside a security perimeter, intermittently yelling, "He served the people!" and "He was a good cadre!"

"It's definitely the last performance of Bo Xilai on the platform of history," said Zhang Lifan, a Chinese historian and political analyst. "Bo is a man with no bottom line and for him, if his political life is ruined, it would be equal to killing him."

"He knows that he's a banner to many of his fans and it's his last chance to go all out to defend his reputation," Zhang said.

Despite Bo's feisty defense, a verdict of guilt against Bo is all but assured because the outcome of trials involving high-profile politicians in China are usually decided in backroom negotiations by politicians and handed down by the court.

"It's very much like a martial arts demonstration," said Ding Xueliang, a Chinese politics expert at Hong Kong University of Science and Technology. "You hit somebody in the face, he hits you back, but eventually nobody gets badly injured and the result has been previously discussed and managed."