IELTS là bài kiểm tra tiếng Anh đã được chứng minh của thế giới. Hơn 1,4 triệu thí sinh tham dự kiểm tra mỗi năm để bắt đầu cuộc hành trình của họ vào giáo dục quốc tế và việc làm. IELTS được công nhận bởi hơn 6000 tổ chức tại hơn 135 quốc gia. Bạn có thể dựa vào IELTS - thử nghiệm thiết lập các tiêu chuẩn | Practice Test 2 READING READING PASSAGE 1 You should spend about 20 minutes on Questions 1-12 which are based on Reading Passage 1 below. Right and left-handedness in humans Why do humans virtually alone among all animal species display a distinct left or right-handedness Not even our closest relatives among the apes possess such decided lateral asymmetry as psychologists call it. Yet about 90 per cent of every human population that has ever lived appears to have been right-handed. Professor Bryan Turner at Deakin University has studied the research literature on left-handedness and found that handedness goes with sidedness. So nine out of ten people are right-handed and eight are right-footed. He noted that this distinctive asymmetry in the human population is itself systematic. Humans think in categories black and white up and down left and right. It s a system of signs that enables us to categorise phenomena that are essentially ambiguous. Research has shown that there is a genetic or inherited element to handedness. But while left-handedness tends to run in families neither left nor right handers will automatically produce off-spring with the same handedness in fact about 6 per cent of children with two right-handed parents will be left-handed. However among two left-handed parents perhaps 40 per cent of the children will also be left-handed. With one right and one left-handed parent 15 to 20 per cent of the offspring will be left handed. Even among identical twins who have exactly the same genes one in six pairs will differ in their handedness. What then makes people left-handed if it is not simply genetic Other factors must be at work and researchers have turned to the brain for clues. In the 1860s the French surgeon and anthropologist Dr Paul Broca made the remarkable finding that patients who had lost their powers of speech as a result of a stroke a blood clot in the brain had paralysis of the right half of their body. He noted that since the left .
