阅读理解。 Michelle Katz is a health-care saving expert with a master's degree in nursing,so when her husband Martin had a heart attack right in front of her,she fought to save his life. Then,she fought the errors on his medical bill and saved the couple $ 7,000. Kaze was talking with her husband in June 2008 when she noticed his face tuming gray. 'I looked over and I said,Martin,are you OK?''she told Good Morning America. 'If I can describe death,that's kind of what I was seeing.  And that's when I grabbed him.  And as I grabbed his hand,it was almost like putting my hand in a vat (桶)  of ice cubes.It was that cold. He started stiffening up. ' Terrified,Katz immediately gave her husband CPR. 'I started pushing down on the compressions (压缩) and was just screaming and saying'Are you OK? Are you still with me ? ''she said. 'I just wanted him to know,even if he wasn't listening,that I was not going to let someone die in my hands. And especially _____ ' Later,X-rays showed that Katz had cracked her husband's ribs (肋骨)  with the force of her compressions.  After 16 long minutes,an ambulance arrived and took Martin to the emergency room. When hospital took over,Katz,the author of two books about saving money on medical bills,started paying attention. She swore to follow the advice she had given others in Healthcare for Less and 101 Health Insurance Tips. 'I knew the dollar signs were going up, ' Katz said. 'That's when I started documenting things. 'In the days that followed,Katz found errors on the bills that,when correctedlsaved her and her husband $ 7,000. 1.  What's the main idea of the passage?  (Please answer within 15 words) ______________________________________________________________________ 2. Which sentence in the passage is the closest in meaning to the following one? In terror,Katz performed compressions on her husband without delay. __________________________________________________________________ 3.  Fill in the black in the fourth paragraph with proper words to complete the sentence. ( Please answer within 10 words) ____________________________________________________________________ 4.  What are the two books mainly about?  (Please answer within 10 words) ______________________________________________________________________ 5. Translate the underlined sentence in the last paragraph into Chinese. _____________________________________________________________________