Everyone has got two personalities---the one that is shown to the world and the other that is secret and real. You don’t show your secret personality when you’re awake because you can control yourself, but when you’re asleep, your sleeping position shows the real you. In a normal night, of course, you often change your sleeping positions. The important position that best shows your secret personality is the one that you fall asleep with.
If you go to sleep on your back, you’re a very open person. You normally trust people and you are easily influenced by fashion or new ideas. You don’t like to upset people. So you never express your real feelings. You’re quite shy and you aren’t very confident.
If you sleep on your stomach, you are a person who likes to keep secrets. You worry a lot and you’re always easily becoming sad. You never want to change your ideas, but you are satisfied with your life the way it is. You usually live for today not tomorrow.
If you sleep curled up(卷曲), you are probably a very nervous person. You have a low opinion of yourself and you often protecting yourself from being hurt, so you are very defensive. You’re shy and you don’t usually like meeting people. You prefer to be on your own. You’re easily hurt.
If you sleep on your side, you have usually got a well-balanced(平衡的) personality. You know your strengths and weaknesses. You’re usually careful. You believe in yourself. You sometimes feel anxious, but you don’t often get unhappy. You always say what you think, even if it makes people rather angry.
1. You may find the passage in_____.| A．a story book. | B．a guide book. |
| C．a sports newspaper. | D．a science magazine. |
| A．He or she is always open with others. | B．He or she is always easily upset. |
| C．He or she always likes new ideas. | D．He or she tends to believe in others. |
| A．curled up. | B．on her back. |
| C．on her stomach. | D．on her side. |
| A．Sleeping positions show people’s secret personalities. |
| B．Sleeping on your side is the best way of sleeping. |
| C．Changing positions will cause sleeping problems. |
| D．Enough sleep makes people look better and healthier. |
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【推荐1】Scientists have discovered how cancer cells use an ‘‘invisibility cloak’’ to hide from the immune system．
They hope understanding the mechanism(机制,原理) will lead to therapies(疗法)in five to ten years that force cancer cells into the firing line of the body’s defenses.
Such a breakthrough would revolutionize the treatment of many deadly cancers, especially those of the breast and lung.
Researchers in Canada found that spreading tumors（肿瘤,肿块）can evade(躲避)the immune system by remodeling（改变…的结构）their DNA “packaging”.
The genetic code within each cell is held within “chromatin(染色质)”, a coiled（圈状的） structure made from lines of DNA wrapped around proteins．Because of chromatin, more than a meter of DNA can be squeezed inside a cell nucleus.
Recently scientists have learned that the chromatin proteins, called histones(组蛋白), have a code of their own which can influence the control of genes.
Professor Wilfred Jefferies and his colleagues found that some cancer cells have the ability to change this “histone code”.
By doing so，they remove the molecular（分子的）“tags” on cells that the immune system relies on to recognize cancer.
Without these tags, cancer cells are invisible to the immune system and can multiply and spread freely.
“This discovery begins to address the mysteries of how cancer hides from the immune system and spreads--it helps explain 20 years of observation in the field,” he said, “It may offer whole new ways for therapies.”
“The invisibility mechanism operates across a range of malignancies(恶性肿瘤) including cancers. But it is particularly active in breast and lung cancers,” the professor said．
He believes within five to 10 years the findings may lead to new therapies that force cancer cells to ‘‘drop the cloak of invisibility’’ and make themselves immune system targets．
1. What’s the significance of the new discovery of cancer cells’ mechanism?| A．It may help deeply understand how cancer cells develop． |
| B．It may make various cancers completely curable． |
| C．It may result in many new ways to the treatment of cancers． |
| D．It may help people improve body’s immune system． |
| A．the immune system cannot wipe out the cancer cells effectively |
| B．the immune system cannot recognize the cancer cells rightly |
| C．the immune system is weak in defending against the cancer cells |
| D．the cancer cells can pretend to be other normal cells |
| A．By a coiled structure of DNA． |
| B．By remodeling their DNA packaging． |
| C．By the molecular tags on cells． |
| D．By an invisibility cloak． |
| A．To remove the ability of cancer cells changing histone code． |
| B．To improve the functions of people’s immune system． |
| C．To develop new immune system able to recognize cancer cells． |
| D．To help people understand the dangers of various cancer cells． |
| A．the incidence of breast and lung cancers may be the highest |
| B．this finding can completely change the traditional therapies of cancers |
| C．the new treatment of cancers will be developed soon |
| D．cancer cells may be the smartest cells in the world |
【推荐2】Making the Most of the Body's Clock
Want to know when the best time is to do your homework and study for your exams? Then just take advantage of your body's clock, and you can work more efficiently(效率高地)and more happily.
Morning
Research shows that in the morning your body can take fatty foods more easily, so don't worry too much about having a big breakfast.
Do you know that the best time for the brain to work well is between 10: 00 am and noon? Therefore, that's the time when you should be listening to your teachers the most attentively.
Lunch-time
Between 12: 00 pm and 2: 00 pm is the best time for eating. The body clock tells your body to help you digest your food at this time, so you have less chance of suffering from stomachache.
Early Afternoon
Late Afternoon
After three o'clock, the body clock starts to tell your body to start working again.
Late Evening
Between 8: 00 pm and 10: 00 pm is the time people are most likely to feel lonely.
| A．Each of us has different body clocks. |
| B．Your body can work more efficiently from 3:00 pm to 5:00. |
| C．You should know about what activities you are fit for at different times of the day. |
| D．It’s best for the body to fight pain between the hours of 9:00 am and 10:00 am. |
| E．It can clear your brain and relax your mind when you have a good sleep. |
| F．The temperature of the boy usually falls at this time and all the body systems slow down. |
| G．Maybe this is one reason why some students will phone or meet their friends at this time. |
Poison has long been an important ingredient in literature and history, and it seems to always be associated with evil, danger and death. But how much do you really know about poison?
An exhibition, The Power of Poison, opened last month at the American Museum of Natural History in New York, intended to give the audience a more vivid understanding of poison. The exhibition will continue until Aug 2014, reported The New York Times.
The museum tour starts in a rainforest setting, where you can see live examples of some of the most poisonous animals: caterpillars, frogs and spiders. Golden poison frogs, for instance, aren’t much bigger than a coin, but their skin is covered in a poison that can cut off the signaling power of your nerves, and a single frog has enough venom to kill 10 grown humans.
The exhibition also features interactive activities. In an iPad-based game, visitors are presented with three puzzling illnesses and asked to identify the poisons based on symptoms. In one case, for example, a pet dog is found sick in a backyard and visitors have to figure out whether it was the toad (蟾蜍), the leaky batteries in the trash or the dirty pond water that did it.
“Poisons can be bad for some things,” Michael Novacek, senior vice president of the museum, told NBC News. “Yet they can also be good for others.”
This is what visitors learn from the last part of the exhibition, which displays how poisons can be used favorably by humans, including for medical treatment.
The blood toxins of vampire bats, for example, can prevent blood from clotting (凝结), which may protect against strokes. A poisonous chemical found in the yew tree is effective against cancer, which is what led to the invention of a cancer-fighting drug called Taxol. One chemical in the venom of Gila monsters can lower the blood sugar of its victims, so it has been used to treat diabetes.
The benefits from natural poisons are not limited to just medicine. Believe it or not, many substances that we regularly take in – chili, coffee and chocolate, etc. – owe their special flavors or stimulating effects to chemicals that plants make to poison insects.
1. By mentioning Snow White and Romeo at the beginning of the story, the author intends to .
| A．show that poison has long been involved in literature |
| B．show that poison is always linked with evil and death |
| C．draw readers’ attention to the topic of the article |
| D．get readers to think of more examples of the use of poison in stories |
| A．To give people more in-depth knowledge about poison. |
| B．To teach people how to handle poisonous animals. |
| C．To inform people about which animals are the most poisonous. |
| D．To show how poison has been used for medical treatment. |
| A．The exhibition will lead visitors to a real rainforest. |
| B．Golden poison frogs are the most poisonous animals on display. |
| C．Those who visit the exhibition can join in some iPad-based interactive games. |
| D．Visitors can listen to lectures on recent studies of poisonous animals. |
