【文章內(nèi)容簡(jiǎn)介】 eir games or the puter to be taken away. Another part of the problem is that people blink (眨眼睛 ) less often when they look at the screen. A person who uses a puter or a digital product blinks about one third as much as we normally do in everyday life. If eyes can’t stay wet or are too tired, they will not be protected like normal. 31. Which of the following isn’ t caused by too much screen time? A. Having headaches. B. Having wet eyes. C. Having red eyes. D. Having tired eyes. 32. Some children don’t tell their parents when their eyes start to feel unfortable because . A. they think it is not serious B. they want to go to hospital themselves C. they don’t want their parents to worry D. they want to continue playing puter games 33. People blink as they normally do when they use puters. A. one third as much B. two thirds as much C. half as much D. one fourth as much 34. From the passage, we can learn that . A. tears can’t protect eyes B. less screen time is good for eyes C. children should blink as much as possible D. an optometrist can’t help ch ildren with their eye problems at all 35. What is the passage mainly about? A. People who often get headaches. B. Some information about the latest digital products. C. Dr. Warford’s experience of working out eye problems. D. Eye problems in children caused by using digital products. C Height is just one of the thousands of features your genes (基因 ) decide. In fact, because you have two parents, your genes provide you a height that usually lands somewhere between the height of each parent. If both your parents are tall, then most probably you will be tall, too. If you have questions about how tall you39。re going to be, ask your doctor if he or she can help you find it out. But genes don’t decide everything. For example, eating an unhealthy diet can keep you from growing to your full potential (潛力 ). Getting plenty of sleep and enough exercise will help you grow to the expected height. No doubt you’re wondering how fast you should grow. It depends. There’s no perfect or right answer. Generally speaking, kids grow about two inches (six centimeters) a year between age three and the time when they start puberty. Your doctor will know how your growth has been going over the years. Two centimeters here and two inches there are not nearly as important as the height you39。 re at now, how you’ve been growing up to this point, and what other changes your body may be going through. Don’t be nervous if you seem to have grown a lot in a very short time. Everyone has a growth spurt (高峰 ) during puberty. The age for starting puberty is about 10 for girls and about 11 for boys. But it can be earlier or later, between 7 and 13 for girls and 9 and 15 for boys. You39。ll usually begin to notice that you’re growing faster about a year or s o after your body starts to show the first changes of puberty. 36. If you want to know how tall you are going to grow, . A. you should have enough exercise B. you can ask your doctor for help C. you should have a healthy diet D. you can record your growth during puberty 37. We can know from the passage . A. how good it is to be a doctor B. how much sleep time we need C. why genes can39。t decide everything D. what is a healthy diet for children 38. The underlined word “puberty” means in Chinese. A. 嬰幼兒時(shí)期 B. 童年時(shí)期 C. 習(xí)慣養(yǎng)成期 D. 生長(zhǎng)發(fā)育期 39. Which is NOT mentioned in the passage? A. Genes decide whether children are clever or not. B. Girls39。 age for starting puberty is usually earlier than boys39。. C. You may be nervous sometimes when you grow too fast. D. Your height most probably depends on how tall your parents are. 40. The main idea of the passage is about . A. the time of children’ s puberty B. the time at which girls grow the most C. the changes of boys’ height at different ages D. the factors(因素 ) that have effect on children’ s h