Which of your hands do you use often? A few of us use both our hands well. Most of us are right-handed. Only about five people out of a hundred are left-handed. New-born babies can take things with either of their hands, but after about two years, they like to use their right hands. Scientists don't know why this happen. They have studied it.
They think our animals ancestors （祖先） were right-handed, but this may not be true. Monkeys are our closest relations in the animal world. Scientists have found that monkeys like to use one of their hands more often than the other one, but it can be either hand. Next time you visit a zoo, watch the monkeys carefully, you'll see that some of them use their right hands, while others use their left hands. But men use their right hands better, and this makes life difficult for the left-handed ones. We live in a right-handed world.
Some scientists have found that more of successful people are left-handed, but they don't know why. Now, they are working hard to discover the secret.
【小题1】What percentage are right-handed according to the passage?
【小题2】New-born babies like to use ________ hands after about two years.
| A．left | B．right | C．left or right | D．both left and right |
【小题3】Which of following is TRUE?
| A．Scientists know why most of us are right-handed. |
| B．New-born babies can use either of their hands well all the time. |
| C．Our animals ancestors were right-handed. |
| D．Life for left-handed people is more difficult. |
【小题4】According to the passage, what kind of animals are the closest to human beings?
| A．Monkeys. | B．Orangutans. | C．Baboons. | D．Macaques. |
【小题5】What is the main idea of the passage?
| A．Most people use their right hands more often. |
| B．Why most people use their right hands more often. |
| C．Some researches on why most people use their right hands more often. |
| D．Most people use their left hands more often. |
