▲閱讀下文，回答第 41−45 題
      Some people choose to purchase organic fruits or vegetables for their health benefitsbecause farmers do not use chemical substances or pesticides during the process of growingthem. However, organic foods are usually associated with high costs, resulting in some peoplenot buying them as a part of their daily diet. For those who cannot afford to buy organic foods,is it really unhealthy to eat regular conventional foods?
      Luckily, some vegetables and fruits do not necessarily have any pesticides left behind afterthey are done growing, so people do not have to worry about the chemicals causing cancer.According to the Environmental Working Group (EWG) in the United States, chemicals areseldom found in certain organic or regular foods. For example, avocados and pineapples do notcontain any pesticides, even though they are not organically planted, because it is quiteimpossible for pesticides to go into their skins. Asparagus is another chemical-free vegetabledue to the fact that it has a natural substance that can break down pesticides. Broccoli containsnatural pesticide materials that will produce an unpleasant smell or taste to keep insects away.Buying organic mushrooms is not necessary because they are usually grown indoors, andfarmers rarely use chemicals to help them grow. The dark purple jackets of eggplants are like aprotective coat that prevents chemicals from entering the vegetable.
     There are a variety of delicious fruits and vegetables that are planted without the use of anychemicals, or the chemicals that are used do not remain on these plants. As long as peoplechoose the right foods, they can still enjoy eating non-organic foods and save money at the sametime.
41. What is the main idea of the passage?
(A) Eating organic food helps fight against cancer.
(B) Organic eating is pricey, but it’s worth the price.
(C) How to keep insects from eating plants isn’t easy.
(D) Certain foods don’t need to be organically planted.