人教版高中英語選修 8 unit 3《inventors and inventions》（section 2）練習題(文件)
【正文】 she39。根據(jù)第二段最后一句可以推知， DPA 的政策要求學生每天應該進行足夠的鍛煉。 3． What does the underlined phrase “huffing and puffing” in the last paragraph probably mean？ A． Learning from each other． B． Joining in all kinds of activities． C． Shouting and laughing a lot． D． Performing a task in cooperation． 答案： B 詞義猜測題。re brushing long enough． “It39。ll be possible to replace the brush on the handle with a brushing unit that also has a camera． The camera can even examine holes in your teeth while you brush． 文章大意：本文主要講述了一種新式牙刷及其多種功能。由第一段的第四句話可知，牙刷檢測刷牙的時間和好壞。to173。s kind of like having a dentist actually watch your brushing on a day173。根據(jù)第四段的 create a game controlled by your toothbrush 可知答案。s children？ A． They were unwilling to brush their teeth． B． They often failed to clean their toothbrushes． C． They preferred to use a toothbrush with a dry head． D． They liked brushing their teeth after Serval came home． 答案： A 推理判斷題。根據(jù)最后一段的 The camera can examine holes in your teeth while you brush 可知牙刷具有檢查功能。emitting diodes) are brightening up our televisions， puter screens， cellphones and nearly every electronic product we use today． __1__ Not just that． LEDs produce bright white light， use energy efficiently， last much longer and are environmentally friendly． __2__It is no wonder that the Nobel Committee has awarded the 2021 Physics Prize to three scientists who developed the blue LED— Professors Shuji Nakamura， Isamu Akasaki and Hiroshi Amano． Electric bulbs have e a long way from the first incandescent bulb(白熾燈 ) developed by Thomas Edison in 1879． Then came the CFL bulb(緊湊型熒光燈 )． The mercury molecules(水銀分子 ) inside a CFL tube can be excited by passing electricity， and send light． CFL bulbs are more efficient than the incandescent ones． __3__For one，the bulbs are expensive， and the mercury inside them can be poisonous if the bulbs break． In 1962， Nick Holonyak came up with the idea of the LED． __4__Some special materials (called semiconductors) can be made to emit light when electricity is sent through them． You may know that atoms consist of electrons moving around a nucleus(原子核 )— just as the plas orbit around our Sun． __5__Electrons can also jump between orbits！ A． The science is simple． B． But there is a difference． C． How efficient are LED lights？ D． However， they did not bee very popular． E． They are efficient enough to run on solar power． F． They are lighting up our homes and offices as well． G． But all this would not have been possible without the invention of the blue173。 3． D 上文提到緊湊型熒光燈比白熾燈更高效，下文提到緊湊型熒光燈不受歡迎的原因，故選 D項 (然而它們不是很受人歡迎 )承上啟下。 Ⅵ ．短文改錯 閱讀短文，文中共有 10處語言錯誤，每句中最多有兩處。修改：在錯的詞下畫一橫線，并在該詞下面寫出修改后的詞。catcher， “Hello ， will you please do me a favor and have a dr
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