A. 80 B. 60 C. 26 D. 20

We're often told to "eat a rainbow", so we believe that the more colors the food has, the better it is. In fact, some white vegetables can offer us lots of nutrients(营养物) that we seem to be missing very often. Here are some white vegetables.
Mushrooms
Mushrooms are low in calorie and fat-free, so they can help you control your weight. And they are a rich source of umami（鲜味）, the fifth basic taste after sweetness, saltiness, bitterness and sourness. They can help simple dishes come alive.
Garlic
Besides tasting great, garlic can help the hair grow and keep colds and flu away. It can also help improve your immune system(免疫系统).
Onions
Julia Child said, "I can't imagine a world without onions, so I always put some onions when I cook for my customers." Onions can help you enjoy your life with a lower risk of cancer and heart disease.
Potatoes
Potatoes provide as much fiber(纤维素) as and more potassium(钾) than other common vegetables or fruit. They also have lots of vitamin C, vitamin B6, magnesium(镁) and small amounts of protein.
()1. The underlined part "eat a rainbow" means "".
A. eat junk food B. eat out on rainy days
C. eat a rainbow for dinner D. eat vegetables in different colors
()2. From the passage we know that white vegetables are .
A. cheap B. healthy C. colorful D. bad
()3. What does Julia Child probably do?
A. A cook. B. A doctor. C. A designer. D. A farmer.
()4. Which is the best title for the passage?
A. Eat a Rainbow B. Eat More Vegetables
C. How to Choose Vegetables D. White Vegetables, Good Medicine

D
【短文大意】本文介绍了日常生活中常见的四种白色蔬菜，它们营养丰富，对一些疾病也有很好的预防作用。
1. D 【解析】词义猜测题。由画线部分后面的“...the more colors the food has, the better it is.”可推测，此处 eat a rainbow 意为“食用不同颜色的蔬菜”。
2. B 【解析】细节理解题。由第一段中的“In fact, some white vegetables can offer us lots of nutrients that we seem to be missing very often.”和下文对四种白色蔬菜的介绍可知，白色蔬菜对我们的健康有好处。
3. A 【解析】推理判断题。由第四段中茱莉娅·查尔德说的话“...so I always put some onions when I cook for my customers.”可知，她给顾客烹调食物时总会放一些洋葱。由此可推断，她可能是一名厨师。
4. D 【解析】标题概括题。本文主要介绍了四种白色蔬菜的药用价值。