Problem: One month before the Winter Olympics begin in the Russian resort town of Sochi -- and in the shadow of last month's deadly bombings in Volgograd -- a huge security operation has swung into gear.

A special exclusion zone went into force Tuesday under which only Sochi-marked vehicles, emergency or specially accredited intelligence service cars will be allowed into the wider Sochi area.

Air traffic and sea access will be restricted, and everyone going into the zone will have to go through heavy security and identity checks.

Russia is pouring huge resources into ensuring that the Games, seen as a flagship project of President Vladimir Putin, go off without incident.

Two bombings in 24 hours last month in Volgograd, one targeting the city's main train station and the second a trolley bus, raised concerns of a potential threat to the Sochi event.

No group has to date claimed responsibility for the attacks, but suspicion has fallen on Chechen separatist groups.

A bitter battle for an independent Chechnya, lasting almost two decades, spawned an insurgency that has spilled into neighboring republics in the North Caucasus region, including Dagestan.

Chechen warlord Doku Umarov, leader of the Islamist Caucasus Emirate group, last summer called on his followers to do what they can to disrupt the Games. He claims they will be held on the graves of Muslim occupants of Sochi, who he says were driven out by Russian imperial forces in the 19th century.

Despite the shockwaves of the Volgograd attack, International Olympic Committee President Thomas Bach said he was confident that Russia would keep the Winter Olympics safe.
1. What event is upcoming?
2. Which organization runs it?
3. Who is in charge of that group?
4. What's his position?
5. Where are the Olympics being held?
6. Which is in what country?
7. Is it an urban location?
8. Who is the leader of Russia?
9. How many bombings were there?
10. How much time passed between them?
11. Where were the explosions?
12. In what city?
13. Has anyone been arrested?
14. Who is thought to have done it?
15. How long has the struggle in Chechnya gone on?
16. What region are they in?
17. Who is a leader in the struggle?
18. What organization is he in?
19. Is he in charge of that?
20. Who used to live in Sochi?
Answer: 1. the Winter Olympics
2. International Olympic Committee
3. Thomas Bach
4. Committee President
5. Sochi
6. Russia
7. no
8. Vladimir Putin
9. Two bombings
10. 24 hours
11. one targeting the city's main train station and the second a trolley bus
12. in Volgograd
13. No
14. Chechen separatist groups
15. almost two decades
16. the North Caucasus region
17. Doku Umarov
18. the Islamist Caucasus Emirate group
19. yes
20. Muslim occupants

Problem: Tristan da Cunha /trstn d kunj/, colloquially Tristan, is both a remote group of volcanic islands in the south Atlantic Ocean and the main island of that group. It is the most remote inhabited archipelago in the world, lying 2,000 kilometres (1,200 mi) from the nearest inhabited land, Saint Helena, 2,400 kilometres (1,500 mi) from the nearest continental land, South Africa, and 3,360 kilometres (2,090 mi) from South America. The territory consists of the main island, also named Tristan da Cunha, which has a northsouth length of 11.27 kilometres (7.00 mi) and has an area of 98 square kilometres (38 sq mi), along with the smaller, uninhabited Nightingale Islands and the wildlife reserves of Inaccessible and Gough Islands.

Tristan da Cunha is part of the British overseas territory of Saint Helena, Ascension and Tristan da Cunha. This includes Saint Helena and equatorial Ascension Island some 3,730 kilometres (2,318 mi) to the north of Tristan. The island has a population of 267 as of January 2016.
1. Which ocean are they located in?
2. Are they close to land?
3. How far away are they?
4. How many people live there?
5. What nation calls them their own?
6. How big is the largest?
7. What is the total size?
8. Are all of them populated?
9. Which aren't?
10. How were they formed?
Answer: 1. Atlantic Ocean
2. No
3. 2,000 kilometres from the nearest inhabited land
4. 267
5. Britain
6. 11.27 kilometres
7. 98 square kilometres
8. No
9. Nightingale Islands, Inaccessible and Gough Islands.
10. unknown

Problem: Simply by analyzing a drop of blood, a doctor will be able to diagnose a birth defect or even cancer when it is in the early stage; using new technology, a material lighter but much stronger than steel can be produced.

These may sound like dreams at present. But the dreams may soon come true as research findings in laboratories are being turned into products more rapidly in the new century, according to experts participating in the fourth Asia-Pacific Economic Cooperation (APEC) Technomart, a technology exhibition and trade fair in Suzhou.

"Most people think nano-technology is too far-fetched to be real. But in fact nano-technology has been applied in a wide range of fields, such as medicine. It is coming into our daily life," said Cheng Jiachong from a Hong Kong-based nano-technology firm.

Nano-technology based on the nanometer, the unit of which is a billionth of a meter, enables scientists to have new concepts of disease diagnosis and treatment on a molecular and atomic scale, Cheng said.

By using nanometer particles, a doctor can separate the fetus cells from the blood of a pregnant woman to see if the development of the fetus is normal. This method is also being used in the early diagnosis of cancer and heart disease, he said.

One of the most significant impacts of nano-technology is at the bio-inorganic materials interface, according to Greg Tegart, executive advisor of the APEC Center for Technology Foresight.

"By combining enzymes and silicon chips we can produce biosensors. These could be implanted in humans or animals to monitor health and to deliver corrective doses of drugs," he told the participants a technology forum during the exhibition.

"Nano-technology could affect the production of nearly every man-made object, from automobiles, tires and computer circuits , to advanced medicines and tissue replacement, and lead to the invention of objects yet to be imagined," said David Minns, a special advisor to the National Research Council of Canada.

It has been shown that carbon nano-tubes are ten times as strong as steel, with one sixth of the weight, and nano-scale systems have the potential to make supersonic transport cost- effective and to increase computer efficiency by millions of times, he said.

The experts agreed that the APEC technology exhibition and trade fair provided many chances for exchanges of innovative ideas and products.
1. What is APEC?
2. What is that?
3. Where is it held?
4. what country?
5. Where does Jiachong work?
6. Where?
7. What is a nanometer?
8. What can doctors do with nanometer particles?
9. Why is this important?
10. What is this method being used for?
11. Who is Tegart?
12. For who?
13. How are biosensors created?
14. What can be done with them?
15. For what purpose?
16. Anothing else?
17. Does nano-technology have other uses?
18. Who is Minns?
19. To who?
20. Is steel stronger than carbon nano-tubes?
Answer:
1. Asia-Pacific Economic Cooperation
2. technology exhibition and trade fair
3. Suzhou
4. China
5. nano-technology firm
6. Hong Kong
7. unit which is a billionth of a meter
8. separate the fetus cells from the blood of a pregnant woman
9. to see if the development of the fetus is normal
10. early diagnosis of cancer and heart disease
11. executive advisor
12. APEC Center
13. By combining enzymes and silicon chips
14. implanted in humans or animals
15. to monitor health
16. deliver corrective doses of drugs
17. yes
18. special advisor
19. National Research Council of Canada
20. no