问题 选择题

人的生长发育以及受损细胞的修复和更新最基本的物质是:

A.蛋白质

B.无机盐

C.水

D.糖类

答案

答案:A

考点:

分析:食物中含有六大类营养物质:蛋白质、糖类、脂肪、维生素、水和无机盐,每一类营养物质都是人体所必需的.

解答:解:蛋白质是构成人体细胞的基本物质,人体的生长发育、组织的更新等都离不开蛋白质.此外,蛋白质还能被分解,为人体的生理活动提供能量.脂肪是人体内备用的能源物质,同时也参与细胞膜的构建;糖类是人体最重要的供能物质,人体的一切活动所消耗的能量主要来自糖类,糖类也是构成细胞的一种成分;人体的各项生命活动都离不开水,人体内的营养物质和废物都必须溶解在水里才能进行运输.无机盐是构成人体组织的重要原料.维生素既不参与构成人体细胞,也不为人体提供能量,而且人体对它的需要量很小,但它对人体的各项生命活动有重要的作用;人体一旦缺乏维生素,就会影响正常的生长和发育,还会引起疾病.

故选:A

点评:此题考查了食物中含有的营养物质对人体的作用,重点考查的是蛋白质对人体的作用.

判断题
阅读理解

Why are people interested in eating raw foods or whole foods? One reason is that eating these types of food reduces the risk of acid accumulation in your body.

Raw and whole foods are usually digested more efficiently than cooked and refined foods. When we cook foods, we destroy the natural enzymes (酶) that are part of the food in its raw form. These enzymes were intended by nature to help us digest the food. When we consume food without these natural enzymes, our bodies either digest the food improperly or allow too many nutrients to be absorbed into the bloodstream. In both instances, the result is obesity. When too many nutrients are absorbed at once, the body grows fat. Improperly digested food moves slowly through the digestive tract, where it becomes increasingly acidic. To protect its vital organs from this acidic waste, the body changes the acid into fat and stores it safely away from the organs.

Processed foods contain chemical elements, which might confuse the appetite mechanism that tells us when we’ve had enough to eat; as a result, people often overeat. Processed foods also upset the digestive cycle. The body will either identify these foods as allergens and then store them safely away from the organs as fat, or the remains of undigested food will become acidic and enter the bloodstream as acid waste, which will stick to the blood vessel walls and block the passage of vital oxygen and nutrients heading for the body’s cells. The body’s metabolism (新陈代谢) becomes inactive, and the result is weight gain and obesity.

The accumulation of acid in the digestive tract makes digestion increasingly inefficient. When that happens, even healthy foods can become acidic and the food allergies will become more common.

To stop this vicious(恶性的) circle in its tracks, people need to consume food and supplements that will neutralize the acid already accumulated in body. Eating the right types of raw and whole foods can help. It’s also important to restore your enzyme balance. You need to identify and avoid the foods that cause acid accumulation and consume the foods that increase enzyme production. If you truly want to change and help your body heal itself, you need to take an active approach.

小题1:It can be inferred from Para. 2 that __________.

A.foods with natural enzymes help people keep fit

B.we’d better be cautious about raw and whole foods

C.it is essential for people to protect their vital organs

D.giving up cooked and refined foods is a new lifestyle小题2:Processed foods are unhealthy because they __________.

A.destroy body’s cells

B.may lead to obesity

C.are difficult to digest

D.stop body’s metabolism小题3:What is the main purpose of this passage?

A.To warn people of the problem of obesity.

B.To advocate eating more raw and whole foods.

C.To inform people of the harm of processed foods.

D.To tell the differences between raw and processed foods.小题4:What is likely to be talked about following the last paragraph?

A.Different causes of acid accumulation.

B.Correct ways to cook raw foods.

C.Suitable types of raw and whole foods.

D.Active approaches to avoid acid.小题5:What can we learn from the text?

A.Processed foods are good for our appetite mechanism.

B.Processed foods also comfort the digestive tract.

C.T he accumulation of acid in the digestive tract makes digestion more effective.

D.Eating the right types of raw and whole foods does good to our body.