阅读理解。 To celebrities, what question is frequently asked besides their loving affairs? It's plastic surgery. And many perfect-looking pop stars keep denying they have changed their facial appearance. Some even get angry at any claims that they've been under the knife . So it was a bit shocking when Chinese singer Heng Yue boldly announced last month she would have plastic surgery, becoming the first celebrity to do so in the mainland. Heng, with a broad range and penetrating(有穿透力的)voice, had been invited to sing the theme song for Chen Kaige's film The Promise and TV drama such as Ma Dashuai and Liu Laogen. But the popularity of the songs shaded her. Her look just wasn't very charming. On March 24, Heng, who declined to reveal her age, endured2 18 operations on her face. It was a comprehensive 8-hour plastic surgery job including nose reshaping and eye operations, said to cost around 650,000 yuan. 'I am so fond of singing,' said Heng, 'I'm hoping to go further in my career as a singer. However, I've found my plain looks are making me less competitive.' Heng said that many TV shows were interested in her singing, but rejected her, saying that she looked just so so. So the chance went to someone who looked more attractive or charming on camera. Certainly, Heng's not the only star to go seeking perfection. Tian Yungcheng, a doctor specializing in plastic surgery, said that Heng was just one of about 200 stars he had operated on. 'Whenever we turn on the TV, mose of the celebrity faces on stage, I believe, have had operation.' Tian said. 'Pop stars are reluctant to tell anyone about their surgery since they're under the pressure from the public who find it hard to accept fake beauty. But I don't see it as wrong if a person just wants to be perfect or have a more pleasant look for others to appreciate.' Tian said. 1．What does the underlined sentence ' they've been under the knife' (in Para. 1) mean? A．They have been wounded with a knife. B．They have had operations on their faces. C．They have been threatened by people. D．They have been the victims of the operations. 2. Which of the following is NOT TRUE about Heng Yue? A．She has a gift for music. B．She keeps her age as a secret. C．She used to have an unattractive face. D．She was the first pop star to have plastic surgery. 3. We can infer that . A．Tian Yungcheng is well-known in celebrity circles B．most people support the beauty industry C．Tian Yungcheng is an attractive doctor D．people have little trouble in accepting fake beauty 4. Why did Heng Yue have plastic surgery? A．She wanted to be a pop star. B．She wanted to marry an attractive man. C．She wanted to be an actress. D．She wanted to be more competitive. 5. Why do some stars get angry when asked about plastic surgery? A．Because they don't want to show off their beauty and wealth. B．Because they can't accept their fake beauty and status in their career. C．Because it's hard to explain to their fans. D．Because they may suffer the pressure from people if they tell the truth.