《2025年通城学典组合训练八年级英语上册译林版苏州专版》

一、阅读理解
A
KEY→P7
范畴:人与社会 主题:科普知识 体裁:说明文 难度:★★★★ 建议用时:7分钟 评价:____/4
Boys and girls, you might feel burned out after working out a difficult Maths problem or studying for a whole day. Are our brains really “burning” when we spend a lot of time thinking? In fact, our brains never stop burning calories, even if we aren’t thinking about anything.
Our brains are powered by glucose(葡萄糖), a kind of sugar that can be found in carbohydrates like rice, noodles and many other foods. The glucose goes to the brain through the bloodstream. It powers the neurons(神经元) in our brains. Since our brain never really rests, it is burning energy in the form of glucose all the time. Even when we sleep, our brain needs energy to keep our body’s basic functions working. These comprise breathing air, digesting food and keeping the body warm.
The brain uses up to 20~25 per cent of the body’s total energy. That’s about 350 calories per day for a woman and 450 for a man. When you are five or six years old, your brain uses up to 60 per cent of the body’s energy.
When we are thinking hard, the brain burns more calories. In one experiment, some scientists found that people who worked on a hard task on a computer ate around 200 calories more than those who were resting. That explains why you feel hungry and eat more after taking exams or studying for a long time.
( B )1. From this passage, we know our brains get energy from ______.
A. resting
B. glucose
C. neurons
D. calories
( C )2. The meaning of the underlined word “comprise” is close to “______”.
A. practise
B. collect
C. include
D. borrow
( D )3. How many calories does a man usually burn in a day?
A. Around 20 to 25.
B. Around 350 to 450.
C. Around 580 to 750.
D. Around 1,800 to 2,250.
( C )4. The passage above probably comes from ______.
A. a storybook
B. a sports report
C. a science magazine
D. a film poster

答案： 1. B 细节理解题。根据第二段中的 Our brains are powered by glucose 可知，大脑从葡萄糖中获取能量。2. C 词义猜测题。根据上文可知，我们的大脑需要能量来让身体的基本功能工作，下文列举了三种身体的基本功能，因此可猜知，comprise 的意思是“包括”，与 include 意思相近。3. D 推理判断题。根据第三段的内容可知，一个正常男子的大脑每天消耗约 450 卡路里，占人体总能量的 20%～25%，通过计算可知，他一天内消耗的总能量约为 1 800～2 250 卡路里。4. C 推理判断题。根据最后一段中的“In one experiment，some scientists found…”以及文章大意可知，该文章是一篇科普说明文，最可能来自一本科学杂志。