第 47 至 50 題為題組         It is an appealing idea that some foods are unhealthy, some healthy, and some super-healthy. About61% of British people reported buying foods because they were supposed superfoods, according to a 2014survey. But what are superfoods? Are they really so good for our health?        Currently, kale is one of the coolest superfoods around. Kale, a very common vegetable, has grown innorthern Europe, and plenty of other places, for thousands of years. Its nutrition is similar to that of cabbage,broccoli, and cauliflower. Is kale significantly better than other vegetables? Fans of superfoods like to listthe things that kale contains a lot of, such as iron and vitamins, and point out what those things do (makered blood cells). But that doesn’t mean your body gets superpowers if you eat more than you need,especially if you’re already getting enough from other sources. It is like trying to make your car go fasterby putting in more petrol. No good evidence shows that eating plenty of fruit and vegetables with kale isany better than eating plenty of them without. ①Another example is chia seeds. ②One hundred grams of chia seeds contain about 17g of Omega-3s,about eight times as much as salmon. ③However, the Omega-3s in chia seeds are different from the onesin fish. ④Our body turns the chia kind into the fish kind very inefficiently, meaning that you will actuallyabsorb less. ⑤Nor is it easy to eat a full 100g of chia seeds, which contain 486 Calories, almost as much asa Big Mac. ⑥So fish is definitely a good source of Omega-3 fatty acids for you, which help to protectagainst cardiovascular disease. ⑦But there is little evidence to suggest the health benefits from chia seeds.         Indeed, good nutrition helps the body fight against diseases. The truth, however, is that nutrition isfabulously complex, different for everybody and mostly mysterious. We know that if you eat a balanceddiet with plenty of fruit and vegetables and do regular exercise, you don’t need any superfood. And if youdon’t, no superfood will save you.
【題組】47. According to the passage, which of the following best describes the author’s attitude towards the healthbenefits of superfoods?（2分）
(A) Doubtful.
(B) Optimistic.
(C) Objective.
(D) Frustrated.