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Option 3: "Modern classrooms and offices don’t help people’s brains to work well. This is because they discourage exercise. Exercise boosts brainpower because during exercise the brain produces a protein that encourages brain development. Our ancestors did a lot more exercise than us and this helped them to survive."
Explanation: This option accurately summarizes the main idea of the text, highlighting how modern environments hinder brain function by discouraging exercise. It correctly states that exercise boosts brainpower through the production of proteins, linking this to the active lifestyles of our ancestors, which is essential to the text's argument.
Option 1: "Brainpower is a survival technique that helped our ancestors. They had to do a lot of exercise and this creates proteins called BDNFs, which help the brain to develop. This is how humans have survived for so long and been so much more successful than other species."
Explanation: This option incorrectly emphasizes survival as the main theme and suggests that brainpower is solely a survival technique. While it mentions exercise and BDNFs, it does not capture the contrast between modern sedentary lifestyles and the active lifestyles of our ancestors, which is central to the text.
Option 2: "People who work or study in modern classrooms or offices don’t get much exercise. Nowadays many people do little except sit and lie down, which isn’t good for proteins in the brain. This contrasts with our ancestors, who walked around 12 miles each day in their struggle for survival."
Explanation: This option focuses on the lack of exercise in modern environments but fails to connect this to the impact on brain development as clearly as the correct answer does. It also does not mention the role of exercise in boosting brainpower, which is a key point in the text.
Option 4: "Our brains produce a special protein when we exercise, which helps the brain to grow and develop. This chemical was important for our ancestors due to the unstable and fast-moving environment in which they lived. However, in our current environment, we get this protein in other ways."
Explanation: This option misrepresents the text by suggesting that we obtain the protein in other ways in modern environments, which is not supported by the text. It also does not emphasize the contrast between modern sedentary lifestyles and the active lifestyles of our ancestors, which is crucial for understanding the text's message.
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