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: Generational differences and the economy are shifting more responsibilities for children from their parents to grandparents, according to a new survey. More than one-third of grandparents aged 50 and older contribute financially to their grandchildren's upbringing, and 11 percent have a grandchild living with them, the poll by AARP, the group for 36 million older US citizens, showed. Forty percent of people who responded to the telephone survey, whose average age was 69, reported spending more than $500 on grandchildren over the past year beyond traditional gifts.Education costs accounted for 53 percent, daily expenses for 37 percent and medical costs for 23 percent.Sixteen percent provided daycare for grandchildren. "They are the safety net for American families, helping to pay for practical expenses and necessities," said Amy Goyer, AARP's multi-generational and family issues expert. "We see many providing daycare services, while growing numbers even have grandchildren living with them," she said, referring to the 16 percent who watch their grandchildren while the parents are at work or school. Generally nearly 90 percent of the 1,904 grandparents questioned said they play a very or somewhat important role in their grandchildren's lives, and about 70 percent live within 50 miles of the closest one. The poll conducted by Woelfel Research Inc.also showed that grandparents were increasingly keyed to the younger generation's life issues and preferred ways of communicating. More than one-third connect with their grandchildren via email or text messaging, while half said they routinely discuss topics ranging from values and spirituality to drug and alcohol use. Nearly 40 percent said they had discussed dating or sex with at least one grandchild.Some 60 percent said they spoke with their grandchildren at least once a week. Most of the grandparents said they had five or more grandchildren, while one-fourth said they had grandchildren of a different race or mixed race.
Question: The passage mainly tells us _ .
Options: (A) the differences between generations are huge (B) how Woelfel Research Inc.conducted the poll (C) parents are the safety net for American families (D) grandparents take more responsibilities for grandchildren
[A]: D

[Q]: Article: Jogging has become the most popular individual sport in America. Many theories,even some mystical ones,have been advanced to explain the popularity of jogging. The plain truth is that jogging is a cheap,quick and efficient way to maintain (or achieve) physical fitness. The most useful sort of exercise is exercise that develops the heart,lungs, and circulatory systems. If these systems are fit,the body is ready for almost any sport and for almost any sudden demand made by work or emergencies. One can train more specifically,as by developing strength for weight lifting or the ability to run straight ahead for short distances with great power as in football,but running trains your heart and lungs to deliver oxygen more efficiently to all parts of your body. It is worth doing that: this sort of exercise is the only kind that can reduce heart disease, the number one cause of death in America. Only one sort of equipment is needed--a pair of good shoes. Physicians advise beginning joggers not to try to run in tennis or gym shoes. Many design advances have been made in only the last several years that make a pair of excellent running shoes indispensable if a runner wishes to develop as quickly as possible,with as little chance of injury as possible. A pair of good running shoes will have soft pads for absorbing shock, as well as slightly built-up heels and full heel cups that will give the knee and ankle more stability. A wise investment in good shoes will prevent blisters and the foot,ankle and knee injuries and will also enable the wearer to run on paved or soft surfaces. No other special equipment is needed; you can jog in any clothing you desire,even your street clothes. It takes surprisingly little time to develop the ability to run. The American Jogging Association has a twelve-week program designed to move from a fifteen- minute walk (which almost anyone can manage who is in reasonable health) to a thirty-minute run. A measure of common sense,a physical examination,and a planned schedule are all it takes.
Question: The main purpose of this passage is to _ ..
Options: (A) discuss jogging as a physical fitness program (B) describe the type of clothing needed for jogging (C) provide scientific evidence of the benefits of jogging (D) launch a nationwide physical fitness campaign
[A]:
A