单词拼写

1.Last week, I s______________ my newly-bought sweater for one in another color.

2.It u__________ him that nobody told him about the whole thing.

3.He asked several questions c______________ the future of the company.

4.We can tell what people think from their facial e________________.

5.Whether it is safe or not is one of the most f________________ asked questions about the Internet.

6.Our president will make an o______________ visit to Tokyo in March and will attend a lot of meetings there.

7.We had planned to complete the new bridge in 2012, but it was finished two years ahead of s______________.

8.He is the chairman of a large international o________________.

9.The temperature is f__________ to reach as low as 4℃ and warm clothes will be needed.

10.Light travels faster than sounds, so we see l________________ followed by thunder on rainy days.

If your head is overheating, you are very likely to yawn(打哈欠) soon, according to a new study that has found the main purpose of yawning is to control brain temperature. The study explains several mysteries about yawning, such as why it’s most commonly done just before and after sleeping, why certain diseases lead to too much yawning, and why breathing though the nose often stops yawning.
“Brains are like computers,” Andrew Gallup, a researcher in the department of Biology at Binghamton University who led the study, said. “They operate best when cool.”
He and his co-workers Micheal Miller and Anne Clark did researches on yawning in parakeets(长尾小鹦鹉) , which have relatively large brains, live wild in Australia, often experience temperature changes, and, most importantly, do not yawn when others yawn, as humans and some other animals do.
For the study, the scientists put parakeets under three different conditions: increasing temperature, high temperature and normal temperature. While the frequency(频率) of yawns did not increase under the latter two conditions, it increased greatly when the researchers increased the temperature.
It’s now believed yawning operates like a radiator(散热器).
If air in the atmosphere is cooler than the brain and body temperatures, taking it in quickly cools blood, which in turn cools the brain. The new findings also explain why tired people often yawn. Both tiredness and sleep loss can increase brain temperature, while yawning can cool down the brain.
In the future, researchers may focus more on brain temperature and its role in diseases and their symptoms. But the new study on yawning changes the popular idea that yawns are just signs of getting tired of something.
49. What’s the best title for the passage?
A. Why don’t people yawn at normal temperature?
B. The yawn explained—it cools your brain.
C. Yawning operates like a radiator.
D. The cause of yawning—finally found out.
50. The main reason why researchers chose parakeets to do the research is that parakeets______.
A. have very large brains                
B. live wild in Australia
C. are not affected by others’ yawning       
D. experience frequent temperature changes
51. The writer may suggest doing all of the following to stop yawning EXCEPT______.
A. breathing through the nose          
B. turning up the heat
C. enjoying some cool wind               
D. putting a cold towel on your forehead
52. In which section of a newspaper would you most probably read this passage?
A. Discovery.        B. Education.         C. Health.              D. Mystery.

—What a hot summer night! The temperature may be above 40 degree centigrade again.

—Why not get ________ cold beer in the air-conditioned room, watching the second season of The Voice of China? That must be          great fun.

A. a; /                B. /; a               C. the; a             D. a; the

Think about what you had for lunch: Was it a hamburger? A chicken sandwich? Barbecue? What about vegetables? Would it surprise you to learn that what you eat can affect the whole planet?

It can—in a big way. New studies show how food and its production affect the globe and its warming climate. You’ve probably heard of global warming : The temperature is on the rise because humankind has been releasing (排放) amounts of gases into the atmosphere. One of these greenhouse gases is carbon dioxide（二氧化碳）.

What does this have to do with food ? A big part of the carbon dioxide that we put in the atmosphere every year comes from the process of making and eating food. The production of meat contributes a lot of that carbon diode. And much of meat’s contribution comes from beef , which is responsible for releasing even more warming gases into the atmosphere.

The process of making a hamburger ,for example, requires a lot of energy. A cow has to be fed and raised on farmland, and cow waste is a major source of methane (沼气) — an especially powerful greenhouse gas. The cow has to be killed. The meat has to be processed (加工) and shipped to a shop, which takes fuel . Most of the cow won’t even be used for meat that people eat. By the time a hamburger finally lands on a dinner plate, it has made a heavy effect on the environment.

We can reduce the production of global-warming gases by eating less beef .Other kinds of meat like pork and chicken do less harm to the environment—at least in terms of the amount of greenhouse gases released. 

All kinds of meat are harder on the planet than vegetables. To grow and eat a pound of potatoes, for example, sends less than one-quarter pound of carbon dioxide into the air. So changing our diet to less meat and more vegetables, as it turns out, may do the world some good.

1.The questions asked in the first paragraph are used to _____.

2.What is the bad news for meat-eaters?

3.Which is the most environment-friendly food according to the passage?

4.The author wrote the passage in order to _____.

In 1886 explorer Robert Peary traveled to Greenland for the U.S. Navy. Before his journey, no one knew Greenland’s size or shape. On Peary’s first trips, he explored Greenland, mapping parts of it.

When Peary returned to the United States, he went to a businessman to sell some furs. There he met Matthew Henson, an African American mechanic, builder and navigator. When Peary went to Nicaragua on a Navy mission(任务),Henson went with him. When that job was over, the two headed to the Arctic.

Henson and Peary set sail for Greenland. When they landed, Henson built a house for their base camp. Peary and his men set out to explore the land by dog sledge(雪橇). Henson was injured and had to stay at the base. While there, he made friends with the Inuit, the native people.

In 1895 Henson, Peary and Hugh Lee went out on another dog sledge journey. This time, they found Greenland’s northernmost point. They now knew that the North Pole lay under the frozen Arctic Ocean. Peary had hoped to cross the ice. but the group ran out of food and returned to base camp. In the years that followed, Peary and Henson tried several times to reach the North Pole, but each time they failed. On one trip, Peary’s feet froze, and he lost his toes（脚趾）.

Peary and Henson planned last trip when Peary was 53 years old. They started across the sea ice from Ellesmere Island, which is located（位于） north of Canada. The temperature dropped as low as—51 degrees Celsius. The explores’ cheeks froze , and they suffered snow blindness from the sun’s glare. They experienced high winds and storms, and they also faced a hidden danger. Under the frozen ocean were powerful currents（潮流）. The ice moved and broke apart leaving open water, called leads. Twice Peary fell into leads. But eventually he and Henson became the first persons to reach the North Pole.

1. What did Peary and Henson find in 1895?

2. Which of the following words can be used to describe Peary?

3.What was the potential danger that Peary and Henson faced on their last trip?

4.The best title for the passage might be “____”.