Vitamin B could help reduce the effects of the dangerous type of air pollution, according to a new study published on Monday. In the first study of its kind, a team of international researchers looked into the damage caused by one of the pollutants that have the severest impact on health—PM2.5.
They found that Vitamin B supplement could effectively reduce the impact of the tiny particles （颗粒）on the human body, although they stressed that the research was in its early stages. According to the WHO, 92% of the world's people are living in places where the PM2.5 level goes beyond the recommended level. So it’s urgent to find a solution to the problem.
According to this study, published in the PNAS, 10 volunteers were initially exposed to clean air and given a placebo (安慰剂）to check their baseline responses. The group then kept on taking placebos tor tour weeks before being exposed to heavily polluted air from downtown Toronto, where an estimated 1,000 cars passed every hour. The bad air was delivered to the volunteers through an "oxygen type" face mask. The experiment was then repeated, with each volunteer taking a Vitamin B supplement daily, made up of 2.5mg of folic acid, 50mg of Vitamin B6, and l mg of Vitamin B12.
Vitamin B6 can be found in liver, chicken, nuts and other things, and Vitamin B12 in fish, meat, eggs, milk and some cereals. The researchers found that four weeks of Vitamin B supplements — the damage of PM2.5 effects by 28-76%. The results emphasized how prevention at an individual level could be used to fight against the damage of PM2.5, the researchers said.
1.What's the newly discovered effect of Vitamin B in Paragraph 1?
A. It can be used to replace other vitamins in our daily life.
B. It can help lower the air pollution level in the open air.
C. It can reduce the impact of PM2.5 on human bodies.
D. It can get rid of the pollutants remaining in our body.
2.What can be learned from the second paragraph?
A. Further study about the effect of Vitamin B needs to be done.
B. Vitamin B is the most important to human's health.
C. The tiny particles in the air are made up of PM2.5.
D. 92% of the world's people are affected by PM2.5.
3.How did researchers draw the new conclusion about Vitamin B?
A. By referring to a journal. B. By performing experiments.
C. By interviewing scientists. D. By comparing vitamins.
4.You may read the passage on a website about .
A. environment B. medicine
C. education D. health
I stand outside waving at the car pulling slowly out of our driveway. I force a smile, hoping it will cover up my tearing eyes, but I know it’s not working. I run into the house, slam the door behind me, and begin crying. It’s just occurred to me that I can’t see my elder sister, Monsura, in the next four months.
I ask myself why it is that I’m crying when I know she's doing something good for herself. I feel selfish for thinking about it but I’d be lying if I said I was happy for her choosing to study in a university in Boston. When my brother, Shafat, left for college, it was different. I still had one sibling at home to call me the stupidest person on a daily basis.
I am reminded of the things we did together as kids. In our old two-bed-room apartment, our parents gave in to our constant begging and traded rooms with us for one night. It was like being part of the amusement park, using our parents’ big bed as a trampoline (蹦床).It was during the first night that I witnessed a full moon. My sister and I believed my brother. He said that the moon was yellow because it was made from cheese. We made plans to visit the moon so we could melt a part of it and make cheese dip. But now I laugh at myself for being so innocent.
Sitting in front of my computer, I listen to songs that remind me of my two best friends. I come to terms with the fact that there's no longer anyone here to laugh uncontrollably with me or to turn to at night when I have a nightmare.
I’m shaken into reality by the sound of my cell phone ringing. Shafat is calling. I pick up and he immediately says “Thank you for such a great childhood.'' Those few words mean the world to me. We three-way call Monsura and spend the next hour reliving memory after memory, and by the end, I forget that I’m alone at home.
1.Why does the writer feel very sad?
A. She isn't admitted to a university.
B. She has no one to accompany her at home.
C. Monsura thinks she is stupid.
D. Monsura and Shafat didn’t go to the same college.
2.The kids traded rooms with their parents because .
A. they hoped to sleep in one room
B. they expected to see a fall moon
C. they could play together on their parents’ bed
D. they wanted to make plans to visit the moon
3.What is the turning point of the story?
A. That the writer’s brother left home for college.
B. That the writer cried hard on the day when Monsura left.
C. That the writer listened to songs that remind her of something.
D. That the writer talked with her sister and brother on the phone,
4.What might be the best title for the passage?
A. My childhood B. A very sad day
C. A hard-won family union D. The most precious family love
COMMERCIAL INVOICE(发货单) | |||||
Date: December 10, 2016 Invoice No: D15454978E Purchase Order No：8928 Bill of loading/ Air Waybill No:2309456703W | |||||
Contact name: Dan Richman Company name: Scan Technology, Ltd. Company address: 2, South Wabash Chicago, IL60637 Telephone number: (1) 319 554 811 E-mail: danrichman@scantech.com | CONSIGN EE（收件人） Contact name: Lee Haojie Company name: First Computers Co. Company address: 35 HeDong Road Beijing, China Telephone number: (86) 134591102 E-mail: haojie@first.com.cn | ||||
Goods Description | Model number | Quantity | Country of Origin | Unit Value | Total Value |
80211 Handheld Scanner | 8021101 | 3 | USA | $120.00 | $360.00 |
80211Base Communicator | 8021183 | 1 | USA | $200.00 | $200.00 |
80211 Cables and Connectors | 8021111 | 3 | USA | $30.50 | $91.50 |
Comments: Mr. Lee, I am able to offer a 8% discount since your total purchase is above $500. We value your business and are looking forward to more opportunities with you. | Invoice Sub Total | $651.50 | |||
Discount | $52.12 | ||||
Insurance | $0.00 | ||||
Invoice Total | $599.38 | ||||
Shipper's signature :Dan Richman | Number of Package | 1 | |||
Total Weight | 5.15kg | ||||
To: Debbie Hu
From: Lee Haojie
Subject: Handheld Scanners
Ms. Hu, I received the parcel from Scan Technology 1 piece. The scanner model they sent is correct, and the quantity is right. However, I’ve discovered the cables and connectors are all wrong. They are not suitable for the model 8021101.
Can you do me a small favor and go through the product information website and see if the cables and connectors are still compatible (兼容的）with the 8021101 scanners? I have no wish to unpack the cables and connectors and try connecting them to the scanners. I believe we will have problem asking for an exchange if the cables and connectors are not compatible. If the website suggests an incompatibility, please contact Dan Richman and request an exchange for the collect model. (Refer to the invoice for his e-mail address.)
I will only use the scanners for our project once we have resolved the exchange issue. We should not proceed unless we get confirmation (证实）on their compatibility. I am looking to resolve this in the shortest possible time as it would be disastrous to wait for this exchange without making progress on the project.
Haojie
1.Which of the following information is NOT included in the invoice?
A. The weight of the individual items.
B. The sender's address.
C. The names of the items sent.
D. The consignee's contact number.
2.What can be indicated from the invoice?
A. Mr. Lee is a regular customer.
B. The company only sends shipments to China.
C. The company provides a discount on purchases of over $ 500.
D. The shipment will arrive at its point of destination on December 10.
3.What is stopping Mr. Lee from opening all the packages?
A. He wants to send them back.
B. He is going to forward them to Ms. Hu.
C. He received some items addressed to someone else.
D. He wants to double-check on the adaptability of some items.
4.Which of the following does Ms. Hu need to know from the invoice if the cables are found to be incompatible with the scanner?
A. Model number: 8021101
B. E-mail address: danrichman@scantech.com
C. Company address: 35 HeDong Road
D. Air Waybill No: 2309456703W
假定你是李华，你校将在暑假举办国际中学生夏令营，主题为“感受中国文化”。请给你的美国朋友Mary写一封电子邮件，邀请她来参加，并说明相关情况，（大学故宫讲座；浏览故宫、长城等名胜古迹；所需费用等）
注意：1. 词数100左右；
2.可以适当增加细节，以使行文连贯。
Dear Marry,
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Yours sincerely,
Li Hua
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短文。短文中共有10处错误，每句中最多有两处。错误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（∧），并在此符号下面写出该加的词。
删除：把多余的词用斜线（＼）划掉。
修改：在错的词下划一横线，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。
Last weekend,after pay a visit to the city of New York,I visited the Smithsonian Institutions National Air and Space Museum,where lies in Washington,D.C.
The museum,which covers a area of 18,000 square meters,is made of 24 exhibition halls.All kinds of planes, rockets,missiles and spaceship of great importance and variously old instruments that famous pilots and astronauts used are on display.In addition,I see copies of some satellites and aircraft.More interestingly,I tried operating on some aircraft by myself.During the visit,I took lots of pictures as well.
This brief visit helped myself learn much about the history of human's space exploration.It made me more interesting in science and technology.
I've lived in three Asian cities,and they all surprised1.(I) on the upside.In the case of China,here's2.I like it.
It's modern and continues to develop all the time.They have modern3.(city),and excellent transport facilities, including their unmatched high-speed train network.They have excellent hotels,restaurants,and beautiful parks etc.
There's a feeling of safety and4.(free) in Chinese cities.There's no need to tell you what to do and you can see from the behavior of the diverse crowd.People just do5.they want.In most places no policemen6.(see).Do you know that police in China don't have firearms? They usually do their job silently and behave reasonably,7. (add) to the security and order.
The Chinese people are friendly.You will always get help even if you can't speak a Chinese word besides nihao, or they can't speak English.They'll spend time and go out of their way8.(explain) to you how to get somewhere,or how to buy9.train ticket.They'll10.(patient) and enthusiastically explain how to get what you need.They'll be positive and practical all the time while helping you.
