题型:阅读理解 题类:模拟题 难易度:困难
河北省武邑中学2018届高三下学期英语第五次模拟考试试卷
When a dog looks at you with big puppy-dog eyes, it's hard for you to go away, and you may speak out “Awww” without hesitation. However, there's a reason why you find a dogs stare so attractive. That sweet stare actually causes the release of a particular hormone, or chemical messenger in the body. This hormone creates feelings of affection in humans. The same thing happens to dogs when people look back at them. Scientists believe this helps people and their four-legged friends bond, or feel connected. Scientists have wondered what causes dogs to lovingly stare at their owners. To find out, a team of researchers from Azabu University in Japan studied 30 owners and their dogs.
The researchers found that after the pets and their owners spent half an hour together, both showed a rise in oxytocin (催产素). One key role of this hormone in many animals is to promote bonding, like that between a mother and newborn. The increase of oxytocin didn't happen, though, when scientists repeated the experiment with wolves and the humans who had raised them.
A second experiment also found that if dogs were given oxytocin, they looked at their owners longer. Scientists aren't sure exactly why, but this reaction occurred only with female dogs. Their owners oxytocin levels also rose as a result.
The result of these experiments might help answer an age-old question: How did the fearsome wolf ancestor of modern dogs turn into man's best friend? Takefumi Kikusui, an animal scientist who worked on the study, thinks that the change happened when dogs first became domestic (驯养的).
According to Kikusui, there may have been a small group of wild dogs that were naturally friendlier. “Humans are very sensitive to eye contact. By using this special communication tool, the dogs are able to win over our hearts. If they are more likely to make eye contact, it would be easier for them to bond with dog owners,” Kikusui said.
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.
{#blank#}1{#/blank#}. 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. {#blank#}2{#/blank#}.
The most common kind of thermometer is made with mercury inside a clear glass tube. As mercury (or any other liquid) becomes hot, it expands. As it gets colder, it contracts. That is why on hot days the mercury line is high in the glass tube. {#blank#}3{#/blank#}.
First, take a clear glass juice bottle that has a cap; fill the bottle with colored 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 through the nail hole.
{#blank#}4{#/blank#}.
Finally, place a white card on the outside of the bottle and behind the straw. Now you can see the water lever easily.
{#blank#}5{#/blank#}. 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. Now that you know this rule you can make a thermometer of your own that will work. B. People use thermometers which are made by themselves when travelling around the world. C. We use and depend on thermometers to measure the temperature of many other things in our daily lives. 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. Thermometers measure temperature, by using materials that change in the same way when they are heated or cooled. 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 them together. G. 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 degree and boils at 100 degrees. |
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