--It’s great that we’ll go on an organized trip tomorrow.　

--But _____ tomorrow, we’d delay it.

A. It should rain　 B. Were it rain　 C. Would it rain　 D. Should it rain.

Feeling tired lately? Has the doctor said he cannot find anything wrong with you? Perhaps he sent you to a hospital, but all the advanced equipments there shows that there is nothing wrong.

Then consider this, you might be in a state of sub-health(亚健康).

Sub-health, also called the third state or gray state, is explained as a borderline(不明确的)state between health and disease. According to an investigation by the National Health organization, over 45 per cent of sub-healthy people are middle-aged or elderly. The percentage is even higher among people who work in management positions as well as students around exam time.

Symptoms(症状)include a lack of energy, depression, slow reactions, insomnia(失眠), agitation(忧虑), and poor memory. Other symptoms include shortness of breath, sweating and aching in the waist and legs.

The key to preventing and recovering from sub-health, according to some medical experts, is to form good living habits, alternate work with rest, exercise regularly, and take part in open-air activities.

As for meals, people are advised to eat less salt and sugar. They should also eat more fresh vegetables, fruits, fish because they are rich in nutritional(营养的)elements—vitamins and trace elements(微量元素)—that are important to the body.

Nutrition experts point out that it is not good to eat too much at one meal because it may cause unhealthy changes in the digestive tract(消化道). They also say that a balanced diet is very helpful in avoiding sub-health.

1. Middle-aged people may feel sub-healthy, because____.

　 A. they have used up their energy

　 B. they have lost their living hopes

　 C. they have more pressure in life and work

　 D. they begin to get older

2. As for food, experts suggest that ____.

　 A. we should never eat meat

　 B. we should have meals with less salt and sugar

　 C. we should eat less

　 D. we should have meals without salt or sugar

3. The underlined word “alternate” in this passage means ____.

　 A. arrange by turns　　　　　　　 B. cause to take place

　 C. keep up　　　　　　　　 D. take up

------Is ______here?
   -----No, Bank and Lucy were absent.
  A. anybody       B. somebody      C. everybody      D. nobody

Police said they were very c__________ about the boy’s safety.