课时作业(六)
Ⅰ.阅读理解
阅读下面短文，从每题所给的四个选项(A、B、C、D)中，选出最佳选项。
3D Printers on the Rise
How do people traditionally manufacture things? They usually start with a sheet of metal, wood or other material and cut, drill and shave it to create a desired shape. Sometimes, they use a mold made of metal or sand, pour liquid plastic or metal into it and let it cool to create a solid part.
Now, a completely different method is gaining popularity.
On Oct. 9, London Science Museum kicked off its new exhibition, 3D: Printing the Future, with over 600 3D printed objects on display, including space probes (航天探测器), toy dolls and even human organs — basically any product you can think of, reported Live Science.
You might find it hard to believe that an object can actually be “printed out” like a picture. But it is not that hard to understand how it works. Just as a traditional printer sprays ink onto paper line by line, modern 3D printers spread material onto a surface layer by layer, from the bottom to the top, gradually building up a shape.
Instead of ink, the materials the 3D printers uses are mainly plastic, resin(树脂) and certain metals. The thinner each layer is — from a millimeter to less than the width of a hair — the smoother and finer the object will be. And objects always come out in one piece, sparing you the trouble of putting different parts together afterward.
In fact, 3D printers have been around for some time, but until recently they hadn’t been very popular Since few people could afford them. Last year, though, saw a big decrease in the price of 3D printers. For example, 10 years ago a desktop 3D printer might cost ＄20,000, while now it costs only about ＄1,000, according to the BBC. However, as 3D printing technology becomes more
commonplace, it may trigger certain problems. One of them is piracy(盗版行为). “Once you can download a coffee maker, or print out a new set of kitchen utensils(厨房用具) on your personal 3D printer, who will visit a retail store again?” an expert on 3D printing told Forbes News.
Even more frightening, the world’s first 3D printed gun was successfully fired in the US in May of this year, which means that 3D printing could potentially give more people access to weapons.
1. According to the article, in the future, 3D printing technology will probably ________.
A. be applied as widely in our daily life as computers B. enable people to make better purchases in retail stores C. revolutionize the way people make products
D. take the place of normal printers and save lots of energy
2. What was the big event that happened in the 3D printing industry last year?
A. Over 600 3D printed objects were on display in an exhibition. B. The 3D printer became more affordable for consumers. C. The world’s first 3D printed gun was successfully made. D. 3D printing technology came to be used in various fields.
3. Which of the following is one of the concerns about 3D printing technology according to the article?
A. 3D printers cannot put together different parts by themselves. B. Professional knowledge is needed to operate a 3D printer. C. It may increase the number of people with weapons.
D. 3D printers might hurt the profits of companies that make normal printers. 答案与解析
【解题导语】 本文是一篇说明文。文章介绍了3D打印机所使用的材料及其可打印的东西，而作者对其应用前景既乐观又感到忧虑。 1．答案 C
解析 细节理解题。A项文中没有提到，故排除A项；倒数第二段中说一旦3D打印机能够打印出一套新的餐具，谁还会再去零售商店?故B项不正确。而C项要革新人们制造产品的方式，这与文中第一、二段所说明的情况是一致的；因为文中并没提到3D打印机要替代正常打印机和节能的问题，故D项不正确。 2．答案 B
解析 细节理解题。由倒数第三段中的Last year，though，saw a big decrease in the price of 3D printers．可知，应选B项。 3．答案 C
解析 细节理解题。最后一段提到3D打印机所带来的隐患——打印武器，这样就会使拥有武器的人越来越多。故选C项。
The sunflower plant bears bright yellow flowers that always face the sun, hence the name. However, the plant is grown not only for its beautiful flowers, but also for its oil that has a host of health benefits. Sunflower oil prevents diseases, lowers cholesterol levels, keeps the heart healthy, and even prevents certain forms of cancer. Sunflower oil is a kind of “magic oil” when it comes to skin care, as it makes your skin soft and smooth, and prevents signs of aging. So, let us know more about its effects on your skin.
1. It Acts as an Effective Emollient(润肤霜).
Sunflower oil is an effective emollient, which means that it helps the skin retain moisture. Thus, people with dry skin can benefit immensely from the regular use of the oil. Also, it is mild, soothing, and provides relief from irritation and inflammation of the skin.
2. It Offers Sun Protection.
Sunflower oil is a rich source of vitamin E. The high vitamin content prevents the sensitive cells of the skin from being damaged by the ultraviolet (UV) rays of the sun. Also, the beta-carotene (β-胡萝卜素) present in sunflower oil helps neutralize free radicals that are responsible for causing damage to the skin, including sunburn and skin cancers.
3. It Prevents Earlier Aging.
Vitamin E present in sunflower oil not only protects the skin from sun damage, but also from earlier aging. What’s more, regular use of sunflower oil can reduce wrinkles and make one look younger. Also, sunflower oil is rich in antioxidants(抗氧化物质) that keep the skin fresh.
4. It Prevents Skin Infections.
Sunflower oil is a rich source of essential fatty acids that protect the skin from bacterial infections. Hence, it gives you a healthy skin.
5. Additional Effects.
There are other ways in which sunflower oil can prove to be a boon for your skin. These are given as follows:
It helps reduce dark spots; it helps lighten dark circles; it helps soften rough and dry skin; it can be used to remove make-up; it helps relax tired eyes. 4. Sunflower oil can be good for the following EXCEPT ________. A. reducing cholesterol levels B. preventing heart diseases
C. making skin smooth and impressive D. curing some kinds of cancers
5. Sunflower oil can protect you from sunburn ________. A. because it helps the skin retain moisture B. because it is indeed high in vitamin E C. because it is a good emollient
D. because it contains slight beta-carotene 6. What are the functions of vitamin E?
A. To make ultraviolet rays and beta-carotene. B. To stop sunburn and treat skin cancers. C. To protect skin and slow the pace of aging. D. To produce wrinkles and make skin bright. 7. Which of the following is NOT true? A. Sunflower oil can weaken dark spots. B. Sunflower oil may lead to skin infections. C. Sunflower oil can make you attractive. D. Sunflower oil may keep eyes in comfort. 8. Which is the best title for the passage? A. Benefits of Sunflower Oil for Skin B. Sunflowers Make Life Beautiful C. Sunflower Oil Ends Diseases Greatly D. Benefits of Growing Sunflowers 答案与解析
【解题导语】 葵花籽油含有较多的维生素E和胡萝卜素，有预防疾病、降低胆固醇含量、保持心脏健康等作用。其中的维生素E，能使皮肤光滑，有助于减缓衰老。 4. 答案 D
解析 细节理解题。依据文章第一段可知，葵花籽油可预防疾病，降低胆固醇含
量，保挣心
脏健康，预防某些癌症，使皮肤柔软、光滑。但是葵花籽油并不能治愈癌症。 5. 答案 B
解析 细节理解题。依据文中It Offers Sun Protection.这一段可知，葵花籽油富含维生素E，维生素E可以防止皮肤晒伤。 6. 答案 C
解析 细节理解题。依据文中It Prevents Earlier Aging.这一段可知，葵花籽油中的维生素E不仅可使皮肤免受阳光伤害，也可减缓衰老。 7. 答案 B
解析 细节理解题。依据文中It Prevents Skin Infections.这一段可知，葵花籽油富含人体所需的脂肪酸，能保护皮肤免受细菌感染，而不是导致皮肤感染。 8. 答案 A
解析 标题归纳题。依据文章首段中的let us know more about its effects on your skin可知，这篇文章主要讲述了葵花籽油对皮肤的益处。 Ⅱ.语法填空
M: Hi, Deb. I ___1___ (come) up with an idea just this morning for the coming Sunday. ___2___ we be engaged in a ball of basketball or football in the morning? Does the idea appeal to you?
W: ___3___ sounds like fun. I really need to build up my strength.
M: That’s all right. For a couple of years, in my spare time, I ___4___ (take) up some exercise every day to keep in good shape, like playing basketball.
W: And that accounts for the reason ___5___ you always seem so energetic. What about when it rains or snows? Do you call off your exercise in this___6___?
M: Well, bad weather won’t hold me back as long as I want to exercise. ___7___ (stick) to your plan, you can always have a way out. I have some other alternatives. I can make___8___(much)of any opportunities to take up some form of exercise.
W: As soon as I finish up my work, I’ll work out ___9___ plan and figure out what kind of exercise I can do. I really need to get myself ___10___ (bury)in some form of exercise every day, even for a short time. 答案与解析
【解题导语】 两个人商量去运动，并且决定要长期坚持锻炼。
1. came。考查时态。这里用一般过去时与时间状语this morning呼应，故用come的过去式。
2. Shall。考查情态动词。这里第一人称的问句表示提议，用shall，此处意为“我们早上去打篮球或者踢足球好吗?”。
3. It。考查代词。这里用it指代前面提到的建议。
4. have taken。考查时态。语境表示较长时间里一直在做某事，用现在完成时。 5. why。考查关系副词。这里用why引导定语从句，the reason why ...表示“??的原因”。
6. case。考查名词。in this case表示“在这种情况下”，故本空填名词case。 7. Sticking。考查非谓语动词。这里用提示词stick的现在分词形式作状语。 8. the most。考查固定用法。从句意和提示词看，这里用make the most of表示“充分利用”。
9. a。考查冠词。这里用不定冠词a，表泛指。
10. buried。考查过去分词。bury oneself in sth. “专心致志于某事”，这里用过去分词作宾补。 Ⅲ.短文改错
假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。 删除：把多余的词用斜线(＼)划掉。
修改：在错的词下画一横线，并在该词下面写出修改后的词。 注意：1.每处错误及其修改均仅限一词。
2.只允许修改10处，多者(从第11处起)不计分。
A few years before, Jack and I had a quarrel over score in a football match. From then on, we didn’t speak to each other any longer.
One day, when I was standing by a tree read, a ball flew to me and I kicked it back with looking at the player, but while I put up my head, I found it was Jack. Seen him, I was feeling very embarrassed. However, he was smiled to me, so I smiled either. Then we began to make up.
This way the walls between us were torn down with a smile but we become good friends again. 答案
A few years before , Jack and I had a quarrel over ∧ score in a football match.
ago a
From then on, we didn’t speak to each other any loger.One day, when I was standing
more
by a tree read, a ball flew to me and I kicked it back with reading looking at the
reading without
player, but while I put up my head, I found it was Jack. Seen him, I was feeling very
when Seeing
embarrassed. However, he was smiled to me, so I smiled either. Then we began to
smiling too
make up. This way the walls between us were torn down with a smile but we
and
become good friends again. Ⅳ.书面表达
假定你是李华，你们学校的校报正在征集当代世界伟人的生平传记，请根据以下要点给校报写一份关于纳尔逊·曼德拉(Nelson Mandela)的稿件： 人物 纳尔逊·曼德拉(1918. 7. 18-2013. 12. 5) 事迹 致力于人权和种族平等的斗争，并为此入狱27年。 成就 1.1993年获得诺贝尔和平奖； 2.1994年成为南非历史上首位黑人总统。 你的感想 ?? 注意：1. 词数100左右； 2. 可适当增加细节，以使行文连贯。
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思路导航 人物简介一般以时间为顺序，将人物生平的主要事件进行概括。写作时，要由表及里，自然地讲述出人物的伟大之处。最后，就人物的贡献和影响作简要点评。 参考范文
Nelson Mandela, the former president of South Africa, was born on 18th July, 1918, and died at the age of 95. Throughout his whole life, Mandela devoted himself to fighting for human rights and racial equality in South Africa, for which he was in prison for 27 years. In 1993, Mandela was awarded the Nobel Peace Prize. The next year, he was elected the first black president in the history of South Africa.
Contributing greatly to the world, Mandela was highly thought of by all the nations. He was a hero of our time. We will never forget his selflessness and devotion.
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思路导航 人物简介一般以时间为顺序，将人物生平的主要事件进行概括。写作时，要由表及里，自然地讲述出人物的伟大之处。最后，就人物的贡献和影响作简要点评。 参考范文
Nelson Mandela, the former president of South Africa, was born on 18th July, 1918, and died at the age of 95. Throughout his whole life, Mandela devoted himself to fighting for human rights and racial equality in South Africa, for which he was in prison for 27 years. In 1993, Mandela was awarded the Nobel Peace Prize. The next year, he was elected the first black president in the history of South Africa.
Contributing greatly to the world, Mandela was highly thought of by all the nations. He was a hero of our time. We will never forget his selflessness and devotion.
