If we work with a strong will,we can overcome any difficulties,　　 great it is.

A、what　　 B、how　　 C、however　　　 D、whatever

Potatoes can provide one-third of our daily _________（要求）of vitamin C.

Mary __________ the job he offered to her, but she didn’t.

A. can’t take　 　 B. ought to have taken　　 C. should take　　 D. must have taken

The police were seeking more information to find out ____ the rich film star.

A. who was it that killed　　　　　　　　 B. who it was that killed　

C. it was who killed　　　　　　　　　 D. who was it killed

Before going outside in the morning, many of us check a window thermometer(温度计)for the temperature. This helps us decide what to wear. ____1____. We want our food to be a certain coldness in the refrigerator. We want it a certain hotness in the oven. If we don’t feel well, we use a thermometer to see if we have a fever. We keep our rooms a certain warmth in the winter and a certain coolness in the summer.

Not all the thermometers use the same system to measure temperature. We use a system called the Fahrenheit scale. But most other countries use the Centigrade scale.

Both systems use the freezing and boiling points of water as their guide.____ 2_____ .

The most common kind of thermometer is made with mercury(水银)inside a clear glass tube. As mercury (or any other liquid ) becomes hot, it expands. As it gets colder, it contracts(收缩). That is why on hot days the mercury line is high in the glass tube._____ 3______.

First. Take a clear glass juice bottle that has a cap ; fill the bottle with coloured water. Tap a hole in the center of the cap using a hammer and thick nail. Put the cap on the jar. Then stick a plastic straw(吸管) through the nail hole.

_____4______.

Finally. Place a white card on the outside of the bottle and behind the straw. Now you can see the water lever easily.

_____5____.

As the temperature goes down, the water will contract, and the lever in the straw will come down. Perhaps you will want to keep a record of the water lever in the straw each morning for a week.

A．We use and depend on thermometers to measure the temperature of many other things

in our daily lives.

B．Thermometers measure temperature, by using materials that change in the same way

when they are heated or cooled.

C．Now that you know this rule you can make a thermometer of your own that will work.

D．The water will rise in the straw. As the temperature of the air goes up, the water will

expand and rise even higher.

E．They label these in different ways. On the Fahrenheit scale water freezes at 32 degrees and boils at 212 degrees. On the Celsius scale water freezes at 0 degrees and boils at 100degrees.

F．Take wax (you may use an old candle if you have one) and melt some of it right where the straw is struck into the cap to seal把..粘住) them together.

G．People use thermometers which are made by themselves when travelling around the

world.

It's so simple and convenient that it couldn't possibly count (算作) as exercise, right? Wrong. Studies shows that regular walking can help you lose weight and reduce risk of heart disease.

If you don't believe us, then trust the research. In a study published in Diabetes Research in Clinical Practice, Japanese researchers tested fat men before and after they joined a one-year walking plan. All they did was up the number of steps they took during their daily activities, such as walking from the car to the grocery store（杂货店）. The result is: their blood pressure and cholesterol （胆固醇）levels improved and the amount of body fat around their abdomen（腹部） -- the dangerous kind of fat that leads to higher rates of heart disease and diabetes -- decreased.

That's good news, because walking has now become the most popular fitness activity in the United States. Convenient, simple, and gentle on the joints（关节）, walking is perhaps the easiest form of exercise to take. According to studies, four out of five women who start a walking program continue to walk, while half of women who attempt other types of exercise, such as swimming, drop out during the first few months. In addition, research has shown that walking regularly is better than running for your health and for losing weight.

1. From the first paragraph, we can know that in most people’s opinion, walking__________.

　 A. can help lose weight.

　 B. can reduce the risk of heart disease.

　 C. is not a form of exercise.

　 D. is a simple exercise.

2. Which of the following is TRUE according to the passage?

　 A. Many Japanese men and women took part in the one-year walking plan.

　 B. Those who joined the one-year walking plan should do different kinds of exercise.

　 C. Walking has been the most popular fitness activity in America for a long time.

　 D. According to the research, most women prefer walking to other forms of exercise.

3. What’s the best title for the passage?

　 A. What kind of walk do you need?

　 B. Walk to a healthier you.

　 C. How often should you have a walk?

　 D. Walking is better than swimming.

4. Which section of a newspaper is this passage probably taken from?

　 A. Science.　　　 B. Sports.　　 C. Health.　　　 D. Technology.