How long we live is often in the hands of our genes. But researchers have established that certain attitudes and behaviors will give us a better chance of living longer. Here are four tips that help you live much longer.

Step 1. Eat a diet low in saturated fats. People who live the longest tend to have a diet low in fats that come from meats and dairy. They avoid refined sugars, especially those that come in soft drinks. Instead, they drink water or low-fat milk, fruits and green vegetables. 

Step 2. Get plenty of sleep. Studies have suggested that a good night's sleep leads to lower blood pressure. People who sleep less than seven hours a night may cause lots of illness.

Step 3. Get some exercise. Many studies link a lack of exercise to weight gain and a shorter life span. But you don't have to join a gym five days a week. They do get a fair amount of exercise because they walk almost everywhere they go.

Step 4. Keep working, but not too hard. Mortality tables show that death rates for older men who are still working are half of what they are for men of the same age who are fully retired. That doesn't mean you have to keep a job that causes high stress levels. It means staying active and productive. 

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1.How many tips does the passage mention about how to live longer?

A 1

B 2

C 3

D 4

解析：选D。D 细节理解题。根据文章step1- step 4可知。

2.You’d better not eat _____if you want to live linger.

A carrots

B apples

C sugars

D tomatoes

解析：选C。C 细节理解题。根据文章第2段第2句“They avoid refined sugars, especially those that come in soft drinks”可知。

3.What does the underlined word pressure mean in Chinese?

A 压力

B 速度

C 厚度

D 堵塞

解析：选A。A 词义猜测题。根据文章第3段第1句“a good night's sleep leads to lower blood” 可知。

4.Which of the following is not true according to the passage?

A You need to sleep more than seven hours every day.

B You need to take exercise if you want to live longer.

C You’d better stay at home if you are retired.

D Our genes may decide how long you live.

解析：选C。C 推理判断题。根据第5段的第1句“Mortality tables show that death rates for older men who are still working are half of what they are for men of the same age who are fully retired”可知。

5.What’s the best title of the passage?

A How to live longer

B How many hours do you need to sleep

C How to be healthy

D How to do exercise

解析：选A。A 主旨大意题。根据第1段最后1句“Here are four tips that help you live much longer..”可知。这是文章的主题句。