(练习)课时分层作业7 Unit 9 Human TOPIC TALK & LESSON 1-【提分教练】2023-2024学年新教材高中英语选择性必修第三册(北师大版2019)

课时分层作业(七) Ⅰ．单词拼写 1．Women are often ashamed to admit they are being abused(虐待)． 2．The family base was crucial(至关重要的) to my development． 3．She felt she was being dragged into a whirlpool of emotion(情绪)． 4．The car crashed through the barrier(障碍) and came to rest in a field． 5．She wore the identical(完全相同的) dress on both occasions． 6．The second half of the game was dull by comparison(比较) with the first． 7．With so many variables，it is difficult to calculate(计算) the cost． 8．Within this ceremony，each participant(参与者) is given two pieces of paper． 9．It gives us the opportunity to innovate(创新) at speed． 10．The police inferred(推断) that they found her behaviour rather suspicious． Ⅱ．阅读理解 A Summer is coming．It is easy to get too much sun．While there's no cure for sunburn，a small but fascinating new study suggests taking large amounts of vitamin D after exposure may prevent the associated redness and inflammation (发炎) of your skin． In the paper，researchers exposed 20 volunteers to a light resembling(类似) solar radiation to induce a sunburn(晒伤) on a small piece of skin．They then gave the “burn victims” large amounts of vitamin D，and followed up with participants one，two and three days (and a week) later to measure skin redness and thickness．The researchers found that vitamin D decreased inflammation and redness，compared with taking a placebo (安慰剂)．And this effect increased in proportion to how much was consumed(消费)．Vitamin D also appears to increase the activity of a gene(基因)called arginase­1，which is involved in tissue(皮肤组织) repair and healing．Taking 50，000 international units (IU) of vitamin D—125 times the recommended daily allowance—led to a significant reduction in redness and inflammation，compared with the placebo．Those who took 100，000 IU had even less redness and pain；and those who took 200，000 IU had the greatest reduction in inflammation． This is the first study to show vitamin D can reduce inflammation，and suggests that it “could potentially help prevent sunburn，”says s