阅读表达(共五小题，每小题2分，满分10分)
阅读下面短文并回答问题，然后将答案写到相应的位置上(请注意问题后的词数要求)。
[1]Cooking carrots whole before chopping them up increases their anti-cancer properties by 25 percent, researchers say.
[2]Leaving the vegetable intact (完整的) prevents valuable nutrients from being easily washed away into water. They can then be chopped up once cooked without loss of nutrients.
[3]Carrots have long been prized for their health benefits, especially their vitamin and fiber content. They contain huge amounts of carotenoids（类胡萝卜素）which are converted into vitamin A in the body. They are also an excellent source of the anti-cancer compound falcarion (镰叶芹醇). In a previous study, Dr Kirsten Brandt found rats fed on a diet containing carrots or isolated falcarino were less likely to develop tumors than those which were not.
[4]They also found that carrots boiled before they were cut contained 25 percent more falcarino than those that were chopped up first. Carrots which are cut have a higher surface area in contact with water, resulting in greater loss of nutrients, compared with boiling them whole. The heat softens the cell walls in the vegetable, allowing vitamins and falcarino to leach (过滤)out.
[5]Dr Brandt said, "The great thing about this is that it's a simple way for people to increase their uptake of a compound, which is good for you. All you need is a bigger saucepan. Naturally occurring   sugars, responsible for giving the carrots its sweet flavor, were also found in higher concentration in carrots that had been cooked whole."
[6]The team also carried out a taste on almost 100 volunteers comparing carrots boiled before being cut and some that are cut up first. More than 80 percent of volunteers said that carrots cooked whole tasted much better.
[7]Boiling carrots whole appears to help them keep more of the nutrients. This is really a piece of good news because the method is of great value. Some other vegetables, such as parsnips (欧洲萝卜) which are from the same family and have a roughly similar size and texture can also be more nutritious by ____.
1. What’ s the main idea of the passage? (No more than 10 words)
                                                                      
2. Complete the following statement with proper words. (No more than 2 words)
          can be kept by maintaining the vegetable whole when we are washing it.
3. Fill in the blank in Paragraph 7 with proper words. (No more than 3 words)
                                                                        
4. Why do people regard carrots as healthful vegetables? (No more than 8 words)
                                                                         
5. What does the word "those line 2, paragraph 4)  probably refer to? (No more than 2 words)