1、Unit 2 Robots.七选五A lack of sleep causes many problems that greatly affect the quality of life.While no one knows why we sleep, it is a universal biological need._1_How much sleep do I actually need?A study in Finland found that the amount of sleep that relates to the fewest sick days was 7.63 hours
2、a night for women and 7.76 hours for men._2_ When we get sleep fewer than seven hours or our sleep often falls below six hours, we are at an increased risk of health problems._3_Today, some people practice “polyphasic (多阶段的)sleep”， based on the idea that by dividing your sleep into parts，you can get
3、 away with less of it.Professor Dinges concludes its possible to train oneself to need less sleep in short periods._4_ And he notes that even for those who can function well on less sleep, we still dont know how the practice might be affecting chemical processes, mood, and other factors.I cant sleep
4、.Is my phone really keeping me up?When light enters your eye, it hits your retina (视网膜) to send signals to the hypothalamus (下丘脑), which controls sleep cycles.When your retina takes in less light, your hypothalamus assumes its time to sleep and itll signal the pineal gland (松果腺) to make you sleepy.A
5、nd when the hypothalamus senses light，it tells the pineal gland to stop its work._5_ Some research suggests that the light from phones and tablets are especially influential in human sleep cycles.AAdequate sleep can benefit us a lot.BCan I train myself to need less sleep?CHow can I make myself sleep
6、 less?DNo animal with a brain can survive without it.EThis is why were told to minimize screen time before bed.FAnd most adults function best after seven to nine hours of sleep a night.GBut he adds it doesnt seem possible to train oneself to need less sleep per 24hour cycle.本文是一篇说明文，介绍了充足睡眠的重要性。1D解析
7、：根据空前的内容，尤其是“While no one knows why we sleep，it is a universal biological need”可知，尽管没有人知道我们为什么要睡觉，但它是一种普遍的生理需要。空处承接上文，应是与睡眠的重要性有关的，故D项“没有它，任何有大脑的动物都不能生存”符合语境。2F解析：根据该部分小标题“How much sleep do I actually need”及空前的“A study in Finland found that the amount of sleep that relates to the fewest sick days wa
8、s 7.63 hours a night for women and 7.76 hours for men”可知，空处内容应是与研究结果及睡眠的时长对人健康的影响有关的，故F项“而且大多数成年人晚上睡了七至九个小时后工作(表现)最好”符合语境。3B解析：此空为该部分小标题，根据该部分的内容，尤其是“some people practice polyphasic(多阶段的)sleep，based on the idea that by dividing your sleep into parts. less sleep in short periods”可知，该部分主要讲的是人能否训练自己以使自
9、己需要的睡眠更少，再结合文中另外两个小标题为问句可推知，B项符合语境。4G解析：根据语境可知，空处及空后一句与空前的“Professor Dinges concludes its possible to train oneself to need less sleep in short periods”之间存在意义上的转折，故G项“但是他补充道，在每24小时的循环中训练自己需要更少的睡眠似乎是不可能的”符合语境。G项中的“train oneself to need less sleep”与上文中的“train oneself to need less sleep”的照应关系亦是提示。5E解析：
10、根据上文中的“When your retina takes in less light，your hypothalamus assumes its time to sleep and itll signal the pineal gland(松果腺) to make you sleepy.And when the hypothalamus senses light，it tells the pineal gland to stop its work”可知，当下丘脑感知到光时，它会提示松果腺停止工作，即停止输送使人瞌睡的信号，再结合下文中的“the light from phones and t
11、ablets are especially influential in human sleep cycles”可知，E项“这就是我们被告知睡觉前要减少 (看发光)屏幕的时间的原因”符合语境。.翻译下列句子，注意黑体部分要用到本单元的单词、短语或句型，然后将其合并成一篇短文1我的朋友李明从小就渴望自己制造一个机器人。My friend Li Ming had the desire to make a robot himself as a child.2他的父母不让他每天摆弄机器零件。His parents wouldnt have him playing with parts of machi
12、nes every day.3他不得不抽出一些空余时间来搞发明。He had to set aside some spare time to work on his invention.4上了大学后，他开始检测一些电子元件。After he went to college he began to test out some electronic instruments.5他把自己很多其他的爱好都放到一边。He set aside many other hobbies.6到目前为止，很多公司打电话给他，要买他的发明。So far, many companies have rung him up
13、to buy his invention.7这则消息使一家人都很满意。The news is a satisfaction to the whole family.请将以上句子连成一篇语言流畅、用词准确、逻辑严密的短文。My_friend_Li_Ming_had_the_desire_to_make_a_robot_himself_as_a_child.But_for_fear_that_it_would_influence_his_study,_his_parents_wouldnt_have_him_playing_with_parts_of_machines_every_day,_so_
14、he_had_to_set_aside_some_spare_time_to_work_on_his_invention.After_he_went_to_college_he_began_to_test_out_some_electronic_instruments.He_devoted_himself_to_it_and_set_aside_many_other_hobbies,_and_in_the_end,_his_efforts_paid_off.So_far,_many_companies_have_rung_him_up_to_buy_his_invention,_which_is_a_satisfaction_to_the_whole_family.
