阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。选项中有一项为多余选项。

Because of modern medicine, millions of people now live longer, healthier lives, and we are developing new ways to fight diseases (疾病) all the time. ____1____

In the past, most people worked on their feet and moved their bodies all day, so they had lots of exercise. ____2____ Today, many people sit in front of a computer all day at work, and often eat a lot of sweet foods, or foods that are made in factories. This can be a big danger to their health.

The disease that causes most deaths in the world today—three in every ten—is heart disease. But many of these deaths need not happen, and are caused because people have not exercised or eaten well enough. Not exercising, or eating unhealthy food, can sometimes cause another dangerous disease-diabetes (糖尿病). ____3____ In the last twenty years, there has been a big rise in the number of deaths from diabetes.

Smoking is another very big health problem and it causes more than seven million deaths a year. There are lots of very dangerous chemicals in cigarettes (香烟), so smokers can get many diseases. Around the world, fewer people smoke today than twenty years ago, but there were still more than 1.2 billion smokers in 2025. ____4____ Nearly half of all the children in the world are taking cigarette smoke into their bodies every day because they have to spend time near people who smoke.

____5____ When people sit for too long in front of a computer, they can get problems with their eyes, arms, necks, and backs. And when they use computers and cell phones at night, it is often more difficult for them to sleep. Some scientists also think that cell phones may cause health problems because of a kind of energy which they produce called radiation (辐射).

A. This is not just a health problem for cigarette smokers.

B. But in a changing world, there are changing health problems.

C. When someone has diabetes, there is too much sugar in their blood.

D. They also mostly ate natural foods like fruit, vegetables, fish, and meat.

E. Some diseases can move from animals to people, and they can spread very fast.

F. People also worry about new health problems caused by computers and cell phones.

1.1.

A

B

C

D

解析：选B。1. 答案：B 解析：空格前讲述现代医学的进步带来的积极影响，空格后转而介绍过去与现在的生活方式差异引发的健康问题，前后为转折关系。B 项 “但在这个不断变化的世界，健康问题也在不断变化” 恰好承接前文的积极面，引出后文的健康新问题，起到承上启下的转折作用。

2.2.

A

B

C

D

解析：选D。2. 答案：D 解析：空格前介绍过去人们的生活方式 —— 整日劳作、锻炼充足，空格后讲述如今人们的生活和饮食问题，前后为过去与现在的对比关系。前文已讲过去的运动情况，D 项 “他们还大多食用水果、蔬菜、鱼和肉这类天然食物” 补充了过去的健康饮食，与后文的不健康饮食形成对应，内容衔接紧密。

3.3.

A

B

C

D

解析：选C。3. 答案：C 解析：空格前首次提及 “糖尿病” 这一疾病，空格后说明糖尿病死亡人数的变化，此处需要对糖尿病进行简单的解释说明，让读者理解该疾病。C 项 “当人患上糖尿病时，血液中的糖分含量会过高” 精准解释了糖尿病的核心特征，衔接前文的疾病名称和后文的疾病现状，逻辑连贯。

4.4.

A

B

C

D

解析：选A。4. 答案：A 解析：空格前讲述吸烟者的健康问题，空格后转而介绍儿童吸入二手烟的情况，前后为递进关系，说明吸烟的危害不仅限于吸烟者自身。A 项 “这不仅仅是吸烟者自身的健康问题” 恰好起到过渡作用，引出二手烟对他人的危害，符合上下文的递进逻辑。

5.5.

A

B

C

D

解析：选F。5. 答案：F 解析：空格后详细介绍了电脑、手机使用带来的各类健康问题，如视力、骨骼不适，睡眠障碍，辐射隐患等，此处需要引出该段落的核心话题。F 项 “人们还担忧电脑和手机引发的新型健康问题” 直接点题，总领后文的具体内容，为后文的详细阐述做铺垫。