As we know, some children live in the countryside, and some live in the city．Their lives are a little different．Please look at the following table．

1．The storey was done among the ________ between the countryside and the city．

A．teachers                    B．students            C．parents               D．adults

2．About ________ of children in the countryside have good eyesight, but only ________ of children in the city have good eyesight．

A．45%; 75%         B．55%; 75%            C．55%; 25%               D．45%; 25%

3．Which of the following is NOT included in the survey?

A．Ideal jobs．                                           B．After - class activities．

C．Ways of learning．                      D．Results of tests．

4．A classroom in the countryside often has ________ according to the survey．

A．recorders           B．DVD              C．TVs                 D．loud- speakers

5．Which of the following is NOT true according to the survey?

A．Children in the countryside often go to school on foot．

B．Children in the city often have too much homework to do．

C．Children in the countryside often have lots of chores to do．

D．Children in the city don't want to be computer programmers．

A recent survey of 2000 parents in Britain showed that they are often afraid of science questions asked by their curious children only because they have no idea what the answer is. Here is a list of some simple questions that you can ask your parents to see if they know the answers.
Q: Why is the sky blue?
A: You probably know white sunlight is made up of seven colors. While it moves in a straight line when going through space, it starts to divide as it hits “raised area” in the atmosphere. The ones with longest wavelengths pass through easily. The blue , however , can be taken in by the gas molecules (分子) because it has a shorter wavelength , which in turn scatters (使分散) it in different directions. That’s why when you look up at the sky, it appears to be blue.
Q:Why does the moon sometimes appear during the daytime?
A: The simple answer to that is because just like any other object it is being lit by the sun. As long as it is around 45 degrees or even 90 degrees off the sun, it will receive light and be able to be seen. The only time it is not able to be seen during its 28-day orbit (轨道) around the earth is when it is right between the earth and the sun. That’s because its back , which is not lit by the sun, is facing us.
Q: Where do birds/ honeybees go in winter?
A: While the bird part is quite easy, since a lot of them get together and travel, the honeybee part is likely to puzzle your parents. It turns out that these busy insects stop being that active when the temperature drops below 50°F. Instead ,they get together in the lower central area of the hive （蜂巢）and form a ball around their queen. This helps keep both warm enough to survive the cold winter months.
【小题1】The sky looks blue mainly because the color blue in the sunlight_______.

　　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