A. most people call bamboo plant trees

　　B. a bamboo plant may grow 4.5 meters in three days

　　C. the bamboo plant changes its colors when it grows

　　D. a bridge held by bamboo cable was built thousands of years ago

　　54. Why did the engineers teach the poor farmers in Africa to make use of bamboo?

　　A. Because it is cheap.

　　B. Because it is colorful.

　　C. Because it drills fast.

　　D. Because it is used by Asians.

　　55. Which of the following is NOT true?

　　A. There are many different kinds of bamboo with different colors.

　　B. Cables made of bamboo can last for over a thousand years.

　　C. Bamboo can be used for buildings, bridges and watering projects(工程).

　　D. Bamboo plants are able to grow well in any part of the world.

　　B

　　Most people around the world are right-handed. 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 right-handed, so the scientists guessed that right-handedness has always been common through history. Today, only about 10% to 15% of the world’s population is left-handed.

　　Why are there more right-handed people than left-handed ones? Scientists now know that a person’s two hands each have their own jobs. For most people, the hand is used 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 left-handed, and studies have found that left-handedness is twice as common among artists as among people in other jobs.

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