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

　　Subhealth, also called the third state or grey state, is explained as a border line（不明确）state between health and disease. According to an investigation, over 45 percent of subhealthy people are mid-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（焦虑）, and poor memory. Other symptoms include shortness of breath, sweating and aching in the waist and legs.

　　The key to preventing and recovering from subhealth, according to some medical experts, is to form good living habits, alternate（交替）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 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 digestive tract（消化道）. They also say that a balanced diet is very helpful in avoiding subhealth.

A．When you are in a state of subhealth, you should stay home and keep silent.

B．When you are in a state of subhealth, you should go to see a doctor and buy some medicine.

C．When you are in a state of subhealth, you should have yourself examined in foreign countries.

D．When you are in a state of subhealth, you should find out the reason and relax yourself.

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

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 and sugar

A．some illness that people suffer from

B．the way to develop good habits

C．some doctors'advice

D．the link between healthy habits and healthy body

Teachers and parents usually call attention to the pictures when they read storybooks to preschool children. But a new study tells that calling attention to the words and letters on the book may lead to better readers.

The two-year study compared (比较) children who were read to this way in class with children who were not. Those whose teachers most often discussed the words showed clearly higher skills in reading, spelling and understanding.

Shayne Piasta, a professor of teaching and learning at Ohio State University, says most preschool teachers would need only a small change in the way they teach. They already read storybooks in class. The only difference would be increased attention to the printed words.

Ms. Piasta says if you get children to pay attention to letters and words, it makes sense that they will do better at word spelling. But she says studies show that very few parents and teachers do this in a systematic (系统的) way.

They watched more than three hundred children aged four and five in classrooms in Ohio and Virginia. The children came from poor families and were poor in their language skills. They may become bad readers when they enter primary schools later.

Professor Justice says children’s language skills can be improved by discussing with him or her when you are reading a book to a child. There are different ways that adults can talk to children about the letters and words on the page. They can point to a word and discuss the shape of it with a finger. They can point out a word: “This is ‘dog’.” They can discuss the meaning of the word or how the words tell the story. And they can also show how words are written left to right in English.

49. What does the underlined phrase “it makes sense” in Paragraph 4 mean?

A. It can be understood and agreed.                     B. It is impossible to happen.       

C. It can be difficult to imagine and describe. D. It is surprising to see.

50. What can we infer from the passage?

A. Parents are more important than teachers for little children.

B. Teachers need to learn a lot to use the new teaching way.

C. It’s impossible for preschool children to understand words.

D. Skills are important to children’s reading development.

51. The writer wants to tell us that ____.

A. preschool children should have higher discussing skills

B. parents should make a plan to teach their children reading

C. teachers should help children pay attention to printed words

D. languages skills should be discussed with preschool children