2 . When your pet has an emergency，first aid is not a substitute for veterinary(兽医的) treatment.However，before you are able to get your pet to a veterinarian，knowing some basic first aid can help.

Bite Wounds

Approach the pet carefully to avoid getting bitten.Wear a mask for the animal and then check the wound.Clean the wound with large amounts of saline(盐水). If these are not available，then regular water may be used.Wrap large open wounds to keep them clean.

Bleeding

Apply firm，direct pressure over the bleeding area until the bleeding stops.Hold the pressure for at least 10 minutes.Avoid bandages that cut off circulation.

Breathing Stops

Check to see if the animal is choking(窒息) on a foreign object.If an animal is not breathing，place it on a firm surface with its left side up.Check for a heartbeat.If you hear a heartbeat but not breathing，close the animal's mouth and breathe directly into its nose—not the mouth—until the chest expands.Repeat 12 to 15 times per minute.

Burns

Wash the burn immediately with large amounts of cool，running water.Apply an ice pack for 15－20 minutes.Do not place an ice pack directly on the skin.Wrap the pack in a light towel or other cover.If the animal has large quantities of dry chemicals on its skin，brush them off.Water may activate some dry chemicals.

Fractures(骨折)

Symptoms include pain，inability to use a limb(腿). Wear a mask for the pet and look for bleeding.If you can control bleeding without causing more injury，then do so.Watch for signs of shock.Don't try to set the fractures by pulling the limb.Transport the pet to the veterinarian immediately，supporting the injured part as best as you can.

3 . Lisa started climbing five years ago when a friend asked her to climb Mt. Rainier. The ability to experience part of the mountain that few people reach drew Lisa to continuing her climbing. By 2012 she and her husband had climbed the highest points in North America, South America and Europe. They had also volunteered for numerous projects with Adventurers and Scientists for Conservation (ASC). Their latest goal was Mt. Vinson in Antarctica to collect snow samples for ASC.

It was difficult for Lisa’s family who had spent all their lives in Illinois to picture what would draw her to such a remote continent (大陆). Her primary motivation was to safely climb Mt. Vinson, but secondarily she wanted to share the experience with others who, like her father, couldn’t imagine what the coldest continent was like.

As they gradually made their way up toward Mt. Vinson, Lisa’s body got used to the cold, dry air and a heavy pack. Her mind was filled with the vastness of this continent. How is it possible that so few people have seen it? How can it be kept so that others have the opportunity to responsibly do so? Part of her duty was to answer the last question.

After she had collected the snow in a small plastic bottle, she labeled (贴标签) it and stored it for safe keeping. As she watched the snow inside, she thought about the story it would tell. What would researchers learn about this mountain? What had it endured during its lifetime? What would we, as servants of this earth, do with this information? She didn’t have the skills to answer these questions by herself, but knowing that she played a small part in allowing them to be answered was exciting, just as gratifying as reaching the top.

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10 . Most people around the world are right­handed. This also seems to be true in history. In 1799, scientists studied works of art made at different times from 1,500 B. C. to the 1950s. Most of the people shown in these works are right­handed, so the scientists guessed that right­handedness has always been common through history. Today, only about 10% to 15% of the world’s population is left­handed.

Why are there more right­handed people than left­handed ones？Scientists now know that a person’s two hands each have their own jobs. Most people use hands to find things or hold things. The right hand is used to work with things. This is because of the different work of the two sides of the brain.The right side of the brain, which makes a person’s hands and eyes work together, controls the left hand.The left side of the brain, which controls the right hand, is the centre for thinking and doing problems. These findings show that more artists should be left­handed, and studies have found that left­handedness is twice as common among artists as among people in other jobs.

No one really knows what makes a person become right­handed instead of left­handed. Scientists have found that almost 40% of the people become left­handed because their main brain is damaged when they are born. However, this doesn’t happen to everyone, so scientists guess there must be another reason why people become left­handed.One idea is that people usually get right­handed from their parents.

Though right­handedness is more common than left­handedness, people no longer think left­handed people are strange or unusual.