In this task, you're given an article, a question which often contains a blank and four options (associated with "A", "B", "C", "D"). Your task is to find the correct answer (from the given options) for the question from the given article and return one of the options from "A", "B", "C", and "D". Do not generate anything else apart from one of the following characters: "A", "B", "C", "D". There is only one correct answer for each question.

[Q]: Article: Many people cannot start their day without first having a cup of coffee or tea.These drinks help them think clearly and feel more awake.This is because of caffeine,which helps to give a jump start to the nervous system.Now,a report says it may also boost long-term memory. Mike Yassa is a neurobiology professor.He and other researchers wanted to know if caffeine could improve a person's memory.He explains,"After you learn anything,it takes some time for that memory to strengthen.And over the first 24 hours is actually where most of the forgetting happens.So that is where we wanted to intervene with caffeine and see if we can help reduce this forgetting." They took 160 caffeine-free people and showed them pictures of everyday objects. These people were asked if the objects could be found inside the house, or outdoors.Then some of the subjects were given a caffeine pill.The others were given a placebo--a pill containing nothing. 24 hours later,the subjects were shown the exact same images from the day before.They were also shown images with slight differences,and some completely new images. Both groups correctly identified the exact same and completely new pictures.But those who took the caffeine pill were better at spottingthe pictures that were slightly different. Professor Yassa says their answers helped to show the effects of caffeine on memory. And we find that if they are on caffeine they are much more likely to make the right decision." The amount of caffeine the researchers used in the study was similar to one cup of strong coffee.The researchers did not see any improvement to memory from smaller doses of caffeine or when it was given an hour before viewing the images.
Question: What is the focus of the text?
Options: (A) Caffeine can make people addicted. (B) Caffeine can make people energetic. (C) Caffeine can improve long--term memory. (D) Caffeine can make people feel comfortable.
[A]: C

[Q]: Article: TUESDAY, July11 SHANGHAI---The 12thInternational Processing, Packaging & End-Line Printing Exhibition opens at Shanghai New International Expo Centre ( to July 13) Tel: 021 6209 5209 HONGKONG---The Hong Kong International Textile and Garment Machinery and Technology Fair 2006 opens at Hong Kong Convention and Exhibition Centre ( to July 14). Tel: +852 2584 4333 THURSDAY, July 13 SHANGHAI---The China(Shanghai) International Wedding Photographic Equipment Exhibition (Autumn) opens at Shanghai Mart ( to July16 ). Tel: 021 6272 2828 HARBIN, Heilongjiang Province---The Ninth Harbin International Automobile Industry Exhibition and Sports Centre ( to July 17 ). Tel : 0451 5363 5464 FRIDAY, July 14 HONG KONG---The Hong Kong Wedding, Banquet & Wedding Accessories Expo 2006 opens at Hong Kong Convention and Exhibition Centre ( to July 16 ). Tel: +852 2367 8385 WEDNESDAY, July 19 SHANGHAI---The 14thShanghai International Advertising Technology & Equipment Exhibition / Shanghai International Media Technology & Equipment opens at Shanghai New International Expo Centre ( to July 22 ). Tel: 021 6328 8899 SHANGHAI---The Shanghai International Outdoor AD Illuminating Technology & Equipment Exhibition, Outdoor Media Promotion Exhibition opens at Shanghai New International Expo Centre ( to July 22 ). Tel: 021 6321 7522 SHANGHAI---PAPERTECH Shanghai 2006 opens at Shanghai New International Expo Centre ( to July 22 ). Tel: 021 6328 8899
Question: More exhibitions are held in _
Options: (A) Shanghai New International Expo Centre (B) Hong Kong Convention and Exhibition Centre (C) Shanghai Mart (D) Harbin International conference, Exhibition and Sports Centre
[A]: A

[Q]: Article: Harvard researchers have created a tough, low-cost, biodegradable material inspired by insects' hard outer shells. The material's inventors say it has a number of possible uses and someday could provide a more environmentally friendly alternative to plastic. The material, made from shrimp (') shells and proteins produced from silk, is called "shrilk." It is thin, clear, flexible and strong. A major benefit of the material is its biodegradability. Plastic's toughness and flexibility represented a revolution in materials science during the 1950s and '60s. Decades later, however, plastic's very durability is raising questions about how appropriate it is for one-time products such as plastic bags, or short-lived consumer goods, used in the home for a few years and then cast into a landfill where they will degrade for centuries. What is the point of making something that lasts 1,000 years? Shrilk not only will degrade in a landfill, but its basic components are used as fertilizer , and so will enrich the soil. Shrilk has great potential, the inventors said. Materials from which it is made are plentiful in nature, found in everything ranging from shrimp shells, insect bodies to living plants. That makes shrilk low cost, and its mass production possible should it be used for products demanding a lot of material. Work on shrilk is continuing in the lab. The inventors said the material becomes flexible when wet, so they're exploring ways to use it in wet environments. They're also developing simpler production processes, which could be used for non-medical products, like for computer cases and other products inside the home. They're even exploring combining it with other materials, like carbon fibers, to give it new properties.
Question: What has become a concern about plastic?
Options: (A) Using it properly. (B) Producing it cheaply. (C) Developing its properties quickly. (D) Evaluating its contributions fairly.
[A]:
A