根据短文内容，从下框的A—F选项中选出能概括每一段主题的最佳选项选项中有一项为多余项。
The earth is getting warmer. People burn coal, oil and gas and this produces carbon dioxide, methane（沼气）and nitrous oxide. These gases, called “greenhouse gases”, prevent the heat of the sun from leaving the earth’s upper atmosphere and this makes the earth warmer
A few weeks ago a group of scientists produced a report about global warming and the natural world. They wanted to find out if global warming was dangerous for plants and animals. According to what they found, the scientists say that during the next 50 years about 25% of land animals and plants will become extinct. More than a million plant and animal species will be extinct by 2050.
More than 10% of all plants and animals will become extinct. It is too late to save many plants and animals because of the greenhouse gases that are already in the atmosphere. But the scientists say if we control greenhouse gases now, we could save many more plant and animals from extinction.
The scientists studied some regions of the world with a very rich biology. These were Europe, Australia, Central and South America, and South Africa. Their studies showed that species living in mountainous areas had a better chance of survival because they could move uphill, to get cooler. In flat areas, such as deserts, plants and animals would have to move a very long distance to get cooler, so they are in grater danger of extinction.
The scientists found that half of the 24 species of butterflies they studied in Australia would soon become extinct. 60% of the species in the Kruger National Park in South Africa would also die out, and more than 100% of the 300 South Africa plant species they studied would also become extinct. One of the plants in danger of extinction is the national flower of South Africa, the King Protea. They studied 163 tree species in the Cerrado region of Brazil and found that 70 would become extinct. Many of the plants and trees that live in the region live nowhere else in the world. In Mexico, they studied 1,870 species and found that more than 30% of these were in danger of extinction.
How to stop sleeping in Class?
Sleeping in class prevents you from paying attention to the teacher as well as stops you from learning abo
ut the material that is being taught. It can also 
get you in trouble with your teachers. It is important to determine why you are falling asleep in class ant try to change the situation so that you are able to stay awake and pass all of your classes. ____
____ It is reported that teenagers may need more sleep than adults. Go to bed earlier and ,make sure you get as many hours of sleep as your body needs. This is a key to staying awake in class. If you are not tired, you are unlikely to fall asleep.
Eat a healthy breakfast full of nutritious foods. ___ If you get hungry or tired in the middle of the day, try eating a healthy snack like a piece of fruit or some biscuits.
Get involved during class. ____ Taking notes, asking questions and otherwise getting involved in classroom activities and discussions will make you far less likely to doze off.
____ If you have a medical condition that is causing you to fall asleep in class, it will need to be treated by a professional. Prescription drugs may also cause sleepiness as a side effect, so discuss any medicine you are taking with your doctor.
| A．Early to bed and early to rise. |
| B．Enough sleep helps a lot in your studies. |
| C．Get a full night’s sleep on school nights. |
| D．It can provide you with enough protein to fuel your body. |
E. There are a number of different tricks you can use to try to stay awake.
F. Contact your doctor in order to rule out medical conditions that can cause you to fall asleep.
G. If you are actively engaged in the information the teacher is pressing, you are less likely to doze off.
Acts of terrorism have been a reality in many places for years. Terrorism scares everybody because no one knows when or where it will take place. So how do you deal with it all? Here are some things you can do:
Give yourself a fear reality check. Even though your chances of being in an attack are very small, the images you see on TV or online make terrorist attacks seem close by.
Share your feelings. Anger, sadness, fear, and numbness are some of the reactions you might have. Just talking and sharing your feelings with your parents, friends, teachers, and others can help them and help you.
Take care of yourself. As much as possible, try to get enough sleep, eat right, exercise, and keep a normal routine. It may be hard to do, but it can keep you healthy and better able to handle a tough time.
Limit the time you spend watching the news. But spending hours watching the news reports can make you feel more anxious and sad.
You may have heard certain countries, religions, or political causes blamed for terrorism. But very few people believe in killing and hurting innocent(无辜的) people to make their point. Don’t give in to prejudice by blaming a whole group, or disliking people just because of the country where they were born, the faith they practice, the way they dress, or the color of their skin.
| A．Be respectful of others. |
| B．Do something to stop terrorism. |
| C．It’s good to be informed about what’s happening. |
| D．Terrorism may not happen everywhere around the world. |
E. Don’t be embarrassed or afraid to express how you feel.
F. It’s normal to be worried about your safety and your family’s safety.
G. Losing sleep, not eating, and worrying too much can make you sick.
When was the last time you had great fun with your family? So stand up and plan to have fun with your family．
Going to the zoo is definitely a number-one pick for family activities. Other than visiting animals, most zoos nowadays have rides that you can enjoy with your family. Meals are served in the zoo.To add some fun, ask to be the photographer for the day and you might be surprised by how creative you can be．
Even though you might not be really keen on outdoor activities, you can still enjoy your time by playing together after having your lunch．
Visiting the nation's capital would be your choice if you want to go on a trip with your family. Learn more about the history by visiting historical sites.
A treasure hunt is a popular activity, so going hunting with your family is a nice choice. You can train yourself by asking to be the person in charge who can hold the treasure map and make decisions.
Create a video clip with your family. Make your family the characters in the clip. You may talk about your family life in the clip, about your interests or even create a drama.Plant flowers and mow the lawn. After a day of hard work, you can all sit back and enjoy a barbecue at your beautifully cleaned backyard.
| A．History creates topics for you and your family． |
| B．At bedtime read to your young kids and read with your elder kids． |
| C．Family is always the most valuable thing in life． |
| D．Bring your own snacks if you want to save some money． |
E．Doing some yard work together can also be a fun quality time for your family．
F．Having a picnic at the park is also a good activity for your family．
G．Here are two examples．
Ali is from a Middle Eastern country. He now stays in the USA. He smokes a lot of cigarettes every day. He has smoked for nine years. Ali says,“I tried to quit (停止) smoking in my hometown, but it was impossible. My parents smoke. My brothers smoke. All my friends smoke. At parties and at meetings, almost all the men smoke. Here in the United States, not as many people smoke. _______”
Many smokers are like Ali: they want to stop smoking. _______. They know it can cause cancer and heart disease. But it is difficult for them to give up smoking because cigarettes have a drug in them. The drug is nicotine. People who smoke a lot need nicotine.
______ . The nicotine makes him sick. In a few days, the smoker’s body is used to the nicotine, and he feels fine. Later, the smoker needs nicotine to keep feeling fine. Without nicotine, he feels bad.
_______. Many people who quit will soon smoke again. At a party or at work they will decide to smoke “just one” cigarette. Then they will smoke another cigarette, and another. Soon they become smokers again. ___
____
| A．It is very hard to quit smoking. |
| B．But it is said that medicine is needed to stop them from smoking. |
| C．Maybe there is only one easy way to quit smoking: never start. |
| D．The smokers know that smoking is bad for their health. |
E. When a person first begins to smoke, he usually feels terrible.
F. Thus nicotine makes smokers addicted to cigarettes.
G. It will be easier to change the smoking habit here.
To forgive is a virtue, but no one has 
ever said it is easy. When someone has deeply hurt you, it can be extremely difficult to let go of your hate. However, forgiveness is possible, and it can be surprisingly beneficial to your physical and mental health. People who forgive show less sadness, anger and stress and more hopefulness, according to a recent research.
__________ Try the following steps:
Calm yourself. _________ You can take a couple of breaths and think of something that gives you pleasure: a beautiful scene in nature, or someone you love.
Don’t wait for an apology. Many times the person who hurt you does not intend to apologize. They may have wanted to hurt you or they just don’t see things the same way. ________ Keep in mind that forgiveness does not necessarily mean becoming friends again with the person who upset you.
Take the control away from your offender(冒犯者). Rethinking about your hurt gives power to the person who causes you pain. Instead of focusing on your wounded feelings, learn to look for the love, beauty and kindness around you.
_________ If you understand your offender, you may realize that he or she was acting out of unawareness, fear, and even love. You may want to write a letter to yourself from your offender’s point of view.
Don’t forget to forgive yourself. ________ But it can rob you of your self-confidence if you don’t do it.
| A．Why should you forgive? |
| B．How should you start to forgive? |
| C．Recognize the benefits of forgiveness. |
| D．Try to see things from your offender’s angle. |
E.For some people, forgiving themselves is the biggest challenge.
F.To make your anger die away, try a simple stress-management technique.
G.If you wait for people to apologize, you could be waiting an awfully long time.