Are you left-handed? If you are, you make up just 10% of the world’s population.

题型：不详难度：来源：

Are you left-handed? If you are, you make up just 10% of the world’s population.小题1:  Most people write and play musical instruments with their right hands.
Why are so few people left-handed? A new theory, called “cooperation (合作) vs competition” may have the answer.小题2:    When making tools for a right-handed person — like a knife — it was easier if everybody could use the same hand. But some humans wanted to compete instead. So to have an advantage over right-handed people, they would use their left hand to surprise competitors.
小题3:German born American scientist Albert Einstein, British physicist Isaac Newton and British biologist Charles Darwin are some famous “lefties”. At least six US presidents were left-handed, including Barack Obama, Bill Clinton, and Harry Truman.
“Lefties” are also often linked with creativity and visual (视觉) skills.
How can this be? Well, the left side of our brain is where we solve problems. The right side of our brain is where we develop creativity. Right-handers tend (倾向) to use the left side more than the right side.小题4:
“This is why there are more of them in creative areas, such as music, art and writing,” said Alan Searleman, PhD, from St. Lawrence University, New York.
小题5:They tend to have worse memories, often forgetting names and places.

答案

小题1:B
小题2:A
小题3:F
小题4:E
小题5:C

解析

试题分析：这篇短文主要解释了左撇子现象,以及大脑两个半球工作的原理.
小题1:根据上下文意思，如果你是左撇子，那你只占了世界人口的10%，说明我们生活在一个右撇子世界里，因为大多数人写字和弹奏乐器都是用右手，故此题选B。
小题2:下文将到问什么有如此少的走撇子，这是因为在人类进化当中我们需要在一起合作生活，有些人为了在竞争方面比右撇子更有优势他们就会使用左手，给此题选A。
小题3:下文讲到是左撇子的几个天才人物，像爱因斯坦、牛顿、达尔文及美国的几任总统，所以此空是主题句，故选F。
小题4:这段文字讲了人的左右脑的功能问题，为什么左撇子天才较多？因为左撇子比右撇子更平均的使用了左右脑，故选E。
小题5:下文讲的是左撇子的劣势，他们有比较糟糕的记忆力，给此题选C（对左撇子而言并不是一切都是好的）