(Question)
Read the following article and select the best answer. Article: Thick dust rose and a large building collapsed. This was the scene in Zhu Zhou,Hunan Province on May 17. Nine people were killed and 16 injured. Things were similar in the Sichuan earthquake. Thousands of people were buried in the ruins and lost their lives. What if we could have warned them? People are always _ to find a way of preventing buildings' collapse. Better materials and technology help,but they are not a solution. Just like humans,a building has its own life cycle from "birth" to "death".If we know when a building is going to collapse,we can repair it in advance or get out of it before it falls. Now,scientists at the University of Illinois have developed a material that turns red before it breaks. The invention could be used in things like climbing ropes or bridge supports. The research was led by Nancy Sottos,a professor at the university's Beckman Institute,and Douglas Davis,a graduate research assistant. The secret behind the color--changing material is a type of molecule  .A molecule is a group of atoms held together by chemical bonds. Imagine you and your friends standing in a circle,holding hands. Each person stands for one atom,your hands represent the bonds,and the entire circle represents a molecule. If one person lets go of his or her hands,the molecule changes color. The research team put the molecule into a soft material. When the researchers stretched the material,it turned bright red for a few seconds before it broke into two pieces. When they repeatedly stretched and relaxed the material,without breaking it,it only turned a little red. The major problem is that light can get rid of the red color. When the team shone bright light on the molecule,the broken bond was fixed,and the color disappeared. Scientists have yet to do more research before the color--changing molecules can be used outside the lab. Question: What does the passage mainly introduce? - The collapse of a large building in Zhu Zhou, Hunan Province. - A type of molecule that can be put into a soft material - A material that turns red before it breaks. - A way of preventing building from collapsing.
(Answer)
A material that turns red before it breaks.


(Question)
Read the following article and select the best answer. Article: American farmers are raising five percent more goats for meat these days. Goat meat is high in protein and lower in unhealthy fat than many other meats.Even so,the industry is small compared to chicken,beef and pork. But immigration has brought more of a taste for goat to America from all over the world. Experts from the University of Illinois offer some questions for people to consider if they are thinking about raising goats. First of all,do you understand that there always has to be someone to care for the goats? *How much land do you have available? And how good is it? Poor ground may support two to four goats on half a hectare.Better grassland can support six to eight. If goats and cattle share the land,two goats can be added for each cow. The goats will eat weeds and other plants that cattle do not like. *Do you have buildings for the number of female goats you plan to keep during winter? An open,cold,dry barn is better than a closed,warm barn where the air is wet. *Do you have the equipment to clean barns  and to harvest hay  to feed your goats? Or will you get someone else to do it,or buy the hay? The experts say a profitable business in goat meat may take three to five years to establish.And, of course, there are no guarantees . Question: If someone has two hectares of good grass land, what is the maximum number of cows and goats he can raise? - 32 cows and 64 goats. - 32 cows and 32 goats. - 16 cows and 32 goats. - 8 cows and 16 goats.
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16 cows and 32 goats.


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Read the following article and select the best answer. Article: A man accused of failing to return more than 700 children's books to five different libraries in the county was released from prison after a book publisher agreed to post his bond of $1,000.The publisher said."There's a story here.This is a man who loves books.He just can't let go of them.He hasn't stolen a single book.So what's the crime ? We think that Mr.Banish has story to tell.We plan to publish his story." When asked why he didn't return the books, Mr.Banish said,"Well,how could I? They became family to me.I was afraid to return them,because I knew that kids or dogs would get hold of these books and chew them up,throw them around,tear the pages,spill soda on them,get jelly  on them,and drown them in the toilet. He continued,"Books are people,too! They talk to you,they take care of you,and they enrich you with wisdom,humor and love.A book is a guest in my home.How could I kick it out? I repaired tor n  pages.I dusted them with a soft clean cloth.I turned their pages so they could breathe and get some fresh air." "Every week I reorganized them on their shelves so they could meet new friends,My books were HAPPY books.You could tell just by looking at them.Now they're all back in the libraries,on the lower shelves,on the floors,at the mercy of all those runny-nosed kids I can hear them calling me.I need to rescue them.Excuse me.I have to go now." Question: What might happen after the man was set free? - He might stop borrowing books. - He might start a library of his own. - He might go on borrowing books from libraries. - He might return all his books.
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