Many do-it-yourself homeowners are interested in 
trying out solar power to leam about the technology and
perhaps to provide energy for limited-use applications．
There are a variety of ways to find cheap solar panels
（板）, including buying used and building your own
with factory seconds．Both methods will save money
while forcing you to learn the ins-and-outs of a solar
power array （阵列）．
We've all seen solar-powered street signs or PV
panels being used for various purposes at remote locations．
When those units become cracked or chipped and are considered "unsafe", companies are forced to replace them, generally to avoid responsibility issues．Because it's difficult to get rid of PV panels, many companies, if approached, are willing to give them away or to sell them for modest prices．Depending on the degree of damage present, expect to see performance degradation （降级） in the range of 10% to 60%．A multimeter （万用表） can be used to test the panel before buying．If the panel's free, take it anyway．It could still be useful in a home solar project．
A solar panel is really nothing but a box serving as a container for a large group of solar cells．Factory second solar cells are usually sold on eBay at a small part of their regular cost．The cells come in a variety of sizes．You will need to figure out how much power a single cell produces to determine how many will need to be wired together to form an array．
A simple search of the Internet will show numerous sites detailing home solar panel projects．Do-it-yourself lovers are generally quite generous in supply photographs of their work and description of what went wrong and right with the project．
Getting cheap solar panels with slight imperfections, either used or through sales of factory seconds, is a perfect solution for home-built renewable energy projects．The high number of solar lovers online provide a wealth of useful information．Only limited skills are required, plus an understanding of the basic wiring involved．All are well within the talents of almost any home handyman．Beyond the satisfaction of having completed the project, you'll come away with a functional solar panel that will be a source of power for use around the house or at remote locations．
Solar energy systems are quickly becoming more popular with homeowners as prices continue to decline．
72．The author writes the passage to introduce ____．
A．ways of finding cheap solar panels B．ways of saving energy
C．a way of making a solar panel D．a home-built energy system
73．What does the phrase "factory seconds" in the passage refer to?
A．Second-hand factory products． B．Cheap but perfect factory products
C．Faulty factory solar cells． D．The second best factory solar cells
74．From Paragraph 5, we can learn about home-built energy projects that ____．
A．none of them are beyond home handymen
B．a lot of useful information is available on the Internet
C．a perfect solution is to get cheap and perfect solar panels
D．understanding electrical wiring is not necessarily needed
75．What is the author's attitude towards the future of solar energy systems?
A．Optimistic． B．Pessimistic. C．Indifferent． D．Doubtful
What happens inside the skull of a soccer player who repeatedly heads a soccer ball? That question motivated a challenging new study of the brains of experienced players that has caused discussion and debate among soccer players, and some anxiety among those of us with soccer-playing children.
For the study, researchers at the Albert Einstein College of Medicine in New York selected 34 adults, men and women. All of the volunteers had played soccer since childhood and now competed year-round in adult soccer leagues. Each filled out a detailed questionnaire developed especially for this study to determine how many times they had headed a soccer ball in the previous year, as well as whether they had experienced any known concussions (脑震荡) in the past.
Then the players completed computerized tests of their memory and other learning skills and had their brains scanned, using a complicated new M.R.I. technique which can find structural changes in the brain that can’t be seen during most scans.
According to the data they presented at a Radiological Society of North America meeting last month, the researchers found that the players who had headed the ball more than about 1,100 times in the previous 12 months showed significant loss of white matter in parts of their brains involved with memory, attention and the processing of visual information, compared with players who had headed the ball fewer times.
This pattern of white matter loss is “similar to those seen in traumatic (外伤的) brain injury”, like that after a serious concussion, the researchers reported, even though only one of these players was reported to have ever experienced a concussion.
The players who had headed the ball about 1,100 times or more in the past year were also generally worse at recalling lists of words read to them, forgetting or fumbling the words far more often than players who had headed the ball less.The passage is most probably a______.
| A．news report | B．research report |
| C．story for soccer players | D．text for doctors |
In which way can we find the structural changes in the brain?
| A．Computerized test. | B．Questionnaire.. |
| C．Scanning. | D．M.R.I. technique. |
From the passage we can conclude that frequent heading may have_____.
| A．significant effect on brain | B．little effect on one’s brain |
| C．nothing to do with the brain injury | D．one’s memory improved |
The underlined word "fumbling" is closest in meaning to______.
| A．remembering | B．misunderstanding |
| C．recalling | D．missing |
After my dad died on Aug.30, 2001, my mother made sure we marked each anniversary. At first, my brothers and sister and I would travel hours to get home, but eventually we got to the point where just one or two of us would make it back to go to Mass with her and spend the day together.
The great love of her life, the man who broke up with her right before her college graduation, only to return two years later claiming he’d traveled the world and hadn’t found anyone to compare with her, remained a daily presence in her life. She spoke about him so often and kept his memory so alive that people were sometimes surprised to learn that he was gone. She took over the garden where he’d planted and made it her own.
When the 10th anniversary of his death approached, my mom began talking about it and planning for it weeks in advance. The date on her kitchen calendar was circled and marked R.I.P. (Rest in Peace). Of course she wanted all of us there and settled the dates for our coming back.
On Monday — the day before the anniversary — she went to morning Mass and walked downtown for lunch with friends, and later told my sister on the phone that she felt Dad still so close that as she was walking back home, she heard someone yell and thought, “Oh, there’s Dick.”
That evening she went out to water flowers, just as my father, 10 years before, had gone out to the garden to pick vegetables before he died. A neighbor heard the tin watering can strike the ground as she fell and hit her head. My mother died within hours, on Aug.30, 2011, the 10thanniversary. She needed to mark that anniversary, she wanted us all home and my dad had waited long enough.From the second paragraph we know that the author’s father______.
| A．traveled around the world and left her mother |
| B．left her mother first but returned two years later |
| C．had a quarrel with her before her graduation |
| D．was not the right man her mother wanted at that time |
We can infer from the passage that the author’s mother _____.
| A．knew her last day was coming on Aug.30 |
| B．kept everything of her father’s home |
| C．missed Father though he had passed away |
| D．remained a daily presence in his life |
Which of the following statements is true EXCEPT that _____.
| A．Mother died the day before the anniversary of Father’s death |
| B．Mother died in the garden as Father did ten years ago |
| C．Mother died because she fell to the ground accidentally |
| D．Mother died on the same date when Father did ten years ago |
What does the writer imply in the underlined part of the last sentence?
| A．She wanted us to stay at home. | B．Mother missed us very much. |
| C．Mother expected us to get back. | D．That day was her last day. |
Actually we have known a lot of examples and meaningful words to support the fact that we should try our best to ease the bad impression of others. Just like the old saying goes, we should give a better assumption to the one than we think he was. But many of us always fail to do this.
Take the situation of my class for example. Right at the beginning of the first semester when we were freshmen we all showed great favor to each other. And when there was an activity that needed some people to join, we would be willing to attend whether it was interesting or not. And we were really like brothers and sisters, and our class was just like a family, a warm family. But now, I feel tired of those meaningless activities not only because of the boring activities themselves but also the cool response of our classmates.
I think the reasons why the passion of most classmates is so low may be as follows:
To start with, many of us take part in more than one organization, which will certainly make us tired. Also, in the study fields, many of us may find that our courses are sometimes difficult to understand or comprehend, especially the specialized subjects. Moreover, “history” teaches us that if one does not study hard, it is possible to fail in the exams. So it is a big and good excuse to say that “I do really want to attend, but I have a lot of homework to do, so...”
Last but not least, some people believe that some of our leaders should not be regarded as a leader, maybe I should say we, as leaders, lost the reputation, support and trust of yours. At least I am the warm-hearted one, although I cannot promise you that your advice will be adopted surely, at least I will spare no effort to “give” you the right to be heard, and to serve you.
Be active to show your talents and abilities and to create a better image of our class. Most important of all, work painstakingly for a better condition that we should have reached.Which of the following statements is TRUE?
| A．Students’ passion for activities was high at first but disappeared gradually. |
| B．Students’ passion for activities grew gradually because they were interesting. |
| C．Students were too busy to take part in activities after their classes. |
| D．Students were unwilling to participate in activities because of their leaders. |
We can infer from the passage that the writer must be ______.
| A．a supporter of activities | B．a responsible teacher |
| C．a top student in class | D．a devoted class leader |
The writer hopes that all the members of the class will ______.
| A．develop better talents and skills | B．improve their abilities and creativity |
| C．work together to make a better class | D．adopt others’ advice patiently |
It’s not just women who wear skirts. In Scotland, men wear a kind of skirt called kilt. The kilt is their national dress and an important part of their tradition.
A kilt is a colored skirt reaching down to the knees. It has checks（格子）on it with different colors, like red and blue.There are many stories about it. One story is that kilt was invented in the 1720s by an English factory owner, Thomas Rawlinson.
Thomas Rawlinson had a number of Scottish workers in his factory and he thought their clothing got in the way of their work.
Today, most Scotsmen look the kilt as formal dress. They usually only wear them at wedding or big dinner.
| A．Each family in Scotland has it’s own colors. |
| B．There are only a few men who still wear a kilt every day. |
| C．How did the Scots start to wear skirts ? |
| D．It was important for Scots to wear skirts at any time. |
E.So he cut their long clothes into shorter skirts.
F.Wearing skirts is very beautiful for women.
G.Men can wear them, too.
Miss Gogers taught physics in a New York school. Last month she explained to one of her classes about sound, and she decided to test them to see how successful she had been in her explanation. She said to them, “Now I have a brother in Los Angeles. If I was calling him on the phone and at the same time you were 75 feet away, listening to me from across the street, which of you would hear what I said earlier, my brother or you and for what reason?”
Tom at once answered, “Your brother. Because electricity travels faster than sound waves.” “That's every good,” Miss Gogers answered; but then one of the girls raised her hand, and Miss Gogers said. “Yes, Kate.”
“I disagree,” Kate said. “Your brother would hear you earlier because when it's 11 o'clock here it's only 8 o'clock in Los Angeles.” Miss Gogers was teaching her class_________.
| A．how to telephone | B．about electricity |
| C．about time zone(时区) | D．about sound |
Miss Gogers raised this question because she wanted to know whether______.
| A．it was easy to phone to Los Angeles | B．her student could hear her from 75 feet away |
| C．her students had grasped（理解）her lesson. | D．sound waves were slower than electricity |
Tom thought that electricity was _________.
| A．slower than sound waves | B．faster than sound waves |
| C．not so fast as sound waves | D．as fast as sound waves |
Kate thought Tom was wrong because _______.
| A．clocks in Los Angeles showed a different time from those in New York |
| B．electricity was slower than sound waves |
| C．Tom was not good at physics at all |
| D．Tom's answer had nothing to do with sound waves |
Whose answer do you think is correct according to the law of physics?
| A．Tom's | B．Kate's | C．Bath A and B | D．Neither A nor B |