Just as the world’s most respected scientific bodies have confirmed that the world is getting hotter, they have also stated that there is strong evidence that humans are driving the warming. Countless recent reports from the world’s leading scientific bodies have said the same thing. For example, a 2010 summary of climate science by the Royal Society stated that: “There is strong evidence that the warming of the Earth over the last half-century has been caused largely by human activity.”
The idea that humans could change the planet’s climate may be counter-intuitive(与直觉不符的), but the basic science is well understood. Each year, human activity causes billions of tons of greenhouse gases to be released（释放）into the atmosphere. As scientists have known for years, these gases hold heat that would otherwise escape to space, wrapping the planet in an invisible blanket.
Of course, the planet’s climate has always been changing thanks to “natural” factors(因素) such as changes in solar or volcanic（火山的）activity, or cycles relating the Earth’s going around the sun. According to the scientific literature, however, the warming recorded to date matches the pattern of warming we would expect from a build-up of greenhouse gas in the atmosphere – not the warming we would expect from other possible causes.
Even if scientists did discover another reasonable explanation for the warming observed so far, that would beg a difficult question. As Robert Henson puts it in The Rough Guide to Climate Change: “If some newly discovered factor can account for the climate change, then why aren’t carbon dioxide（二氧化碳）and the other greenhouse gases producing the warming that basic physics tells us they should be?”
The only way to prove with 100% certainty that humans are responsible for global warming would be to run an experiment with two identical Earths – one with human influence and one without. That obviously isn’t possible, and so most scientists are careful not to state human influence as an absolute certainty.
【小题1】 In most scientists’ opinion, the global warming is mainly caused by ________.

A voyaging ship was wrecked during a storm at sea and only two of the men aboard were able to swim to a small, desert-like island. Not knowing what else to do, the two survivors agreed that they had no alternativethan to pray to God.
However, to find out whose prayers were more powerful, they agreed to divide the territory between them and stay on opposite sides of the island.
The first thing they prayed for was food. The next morning, the first man saw a fruit-bearing tree on his side of the island, and he was able to eat its fruit. But the other man’s parcel of land remained barren.
After a week, the first man became lonely and decided to pray for a wife. The next day, another ship was wrecked and the only survivor was a woman who swam to his side of the island. But on the other side of the island, there was nothing.
Soon thereafter the first man prayed for a house, clothes and more food. The next day, like magic, all of these things were given to him. However, the second man still had nothing.
Finally, the first man prayed for a ship so that he and his wife could leave the island, and in the morning he found a ship docked at his side of the island.
The first man boarded the ship with his wife and decided to leave the second man on the island, considering the other man unworthy to receive God’s blessings since none of his prayers had been answered.
As the ship was about to leave, the first man heard a voice from Heaven booming, “Why are you leaving your companion on the island?”
“My blessings are mine alone since I was the one who prayed for them,” the first man answered. “His prayers were all unanswered and so he doesn’t deserve anything.”
“You are mistaken!” the voice rebuked him. “He had only one prayer, which I answered. If not for that, you would not have received any of my blessings.”
“Tell me,” the first man asked the voice, “what did he pray for that I should owe him anything?”
“He prayed that all your prayers would be answered.”
For all we know, our blessings are not the fruits of our prayers alone, but those of another praying for us. So what you do for others is more important than what you do for yourself.
【小题1】The first man’s wife is _____.

When an ant dies, other ants move the dead insect out. Sometimes, the dead ant get moved away very soon—within an hour of dying. This behavior is interesting to scientists, who wonder how ants know for sure—and so soon—that another ant is dead.
One scientist recently came up with a way to explain this ant behavior. Dong-Hwan Choe is a biologist. Choe found that Argentine ants have a chemical on the outside of their bodies that signals to other ants, “I’m dead—take me away.”
But there’s a twist to Choe’s discovery. Choe says that the living ants—not just the dead ones—have this death chemical. In other words, while an ant crawls around, perhaps in a picnic or home, it’s telling other ants that it’s dead.
What keeps ants from dragging away the living ants？Choe found that Argentine ants have two additional chemicals on their bodies, and these tell nearby ants something like, “Wait—I’m not dead yet.” So Choe’s research turned up two sets of chemical signals in ants: one says, “I’m dead,” and the other set says, “I’m not dead yet.”
Other scientists have tried to figure out how ants know when another ant is dead. If an ant is knocked unconscious, for example, other ants leave it alone until it wakes up. That means ants know that unmoving ants can still be alive.
Choe suspects that when an Argentine ant dies, the chemical that says “Wait-I’m not dead yet” quickly goes away. Once that chemical is gone, only the one that says “I’m dead” is left. “It’s because the dead ant no longer smells like a living ant that it gets carried to the graveyard, not because its body releases(释放) new unique chemicals after death,” said Choe. When other ants detect the “dead” chemical without the “not dead yet” chemical, they drag away the body.
Understanding this behavior may help scientists figure out how to stop Argentine ants from invading new places and causing problems. Choe would like to find a way to use the newly discovered chemicals to spread ant killer to Argentine ant nests.
The ants’ removal behavior is important to the overall health of the nest. “Being able to quickly remove dead individuals and other possible sources of disease is extremely important to all animals living in societies, including us,” says Choe. “Think about all the effort and money that we invest daily in waste management.”
【小题1】The underlined word “twist” in Paragraph 3 means             .

Alone in the darkness under layers of rubble (碎石) , Dan Woolley felt blood streaming from his head and leg.
Woolley, an aid worker, husband, and father of two boys, followed instructions on his cell phone to survive the January 12 earthquake in Haiti.
“I had an app that had pre-downloaded all this information about treating wounds. So I  looked up excessive bleeding and I looked up compound fracture(断裂),” Woolley told CNN.
The application on his iPhone is filled with information about first aid and CPR from the American Heart Association. “So I knew I wasn’t making mistakes, ” Woolley said. “That gave me confidence to treat my wounds properly.”
Trapped in the ruins of the Hotel Montana in Port-au-Prince, he used his shirt to bandage his leg, and tied his belt around the wound. To stop the bleeding on his head, he firmly pressed a sock to it. Concerned he might have been experiencing shock, Woolley used the app to look up what to do. It warned him not to sleep. So he set his phone alarm to go off every 20 minutes.
Once the battery got down to less than 20 percent of its power, Woolley turned it off. By then, he says, he had trained his body not to sleep for long periods, drifting off only to wake up within minutes.
With his injuries tended to, he wrote a note to his family in his journal: “I was in a big accident, an earthquake. Don’t be upset at God. He always provides for his children even in hard times. I’m still praying that God will get me out, but he may not. But even so he will always take care of you.”
After more than 60 hours, Woolley was pulled from the rubble.
“Those guys are rescue heroes,” he said to the crew that pulled him out.
【小题1】 Which of the following best summarizes the passage?

A．How to deal with the wound.

B．Try to get in touch with outside.

C．How to stay awake under the ground.

D．An unforgettable experience in the earthquake.

The first time I decided to leave home was when 1 was in high schoo1．1 was having trouble getting along will my parents．I had about a hundred dollars in my pocket，and so I thought about leaving home, It took me 6my three weeks away from home when I stared to feel homesick. Living on my own is a totally different experience for three main reasons：being more responsible, more decisive and more creative
First of all，I have learned that living on my own requires that I become more responsible．My parents usually tell me to carry out my work and duties almost every day．men I fail to do the work，I only get scolded. However now that I am on my own，I get to deal with my duties without being told to．When I fail to do my duties，I must also deal with the result by myself
Another different experience for me while living on my own is that now I have become more decisive. ·I have to be more careful since I am on my own because my parents are not here to give me their advice. I must make my own decisions．For example，I must make the best decisions for myself without hurting anybody’s feelings and without my parents，guidance．
Therefore，I became more creative just by living on my own．I could make my own future plan-l have made rules for myself to follow．This to me is a good experience，because I usually think that being creative is the．nicest thing in the world．However, when 1 was with my parents
l found it hard for me to be creative simply because I always followed their ideas．
In conclusion，these are the things that usually happen when I am with my parents and when I am alone. Besides，I think that it is better for everyone to love their parents and themselyes before they love anyone else．They should leam how to live on their own. but meanwhile learn how to follow every technique that was given to them by their Parents．They can make use of their freedom of choice to lead to wherever they want。
【小题1】According to the text，the author decided to leave home because