I'm taking a test and have to guess the right answer to the question after the article. Article: A few days ago I got a call from my old college friend whom I haven't seen for a very long time. The topic, which was about all the good old times that we had changed to a touching story when he started talking about his father. His father's declining health made him stay at the hospital. Because of his illness, his father suffered from insomnia and often talked to himself. My friend, who had not been able to sleep for a few days as he had to keep watching his father's condition, became irritated and told his father to keep silent and try to get some sleep. His father said that he really wanted to sleep well because he was very tired and told my friend to leave him alone in the hospital if he did not want to keep him company. After his father finished talking, he fell unconscious . My friend was very sorry for speaking the ill words towards his father. My friend, whom I knew as a tough person, cried as a baby on the other end of the telephone. He said that from that moment on, he prayed every day, asking God to let his father wake up from his coma. He promised himself that whatever words came out from his father's mouth after he regained his consciousness, he would gladly take them. His only hope for God was to give him a chance to _ his past mistake. Often, we complain when we have to accompany or watch over our parents for years, months, days, hours or even minutes. But do we realize that our parents keep us company and watch over us for as long as we (or they) live? From the day we were born to our adulthood, and even when deaths come to us, they are always at our side. Imagine how sad our parents will be when they hear a seemingly innocent word of "no" come out from our mouths. We can make promises to ourselves that from now on there will be no more complaints that come out from our mouths when we have to watch over or accompany our parents. No more complaints come out from our mouths when we feel that our parents have treated us like little children. There are so many unlucky ones who have neither... Question: What does the writer want to tell us in the passage? Options: A: Your parents will keep talking to themselves when they are old. B: Be good to your parents when you still have the chance. C: You will regret in your life if you don't show your kindness to your parents. D: It is not easy to take good care of sick old parents.
B

I'm taking a test and have to guess the right answer to the question after the article. Article: Flickering lights are annoying but they may have an advantage. Visible light communication (VLC) uses rapid pluses of light to transmit information wirelessly. Now it may be ready to compete with conventional Wi-fi. In a recent TED talk, Harald Hasas from the University of Edinburge,UK demonstrated one VLC prototype ,"Li-Fi", transmitting a video from a store-bought LED lamp to a solar cell to a laptop. "Li-Fi is essentially the same as Wi-Fi,except for a small difference- we use LED lights around us to transmit the data wirelessly as opposed to using radio," Haas says. Once established, VLC could solve some major communication problems. In 2009, the US Federal Communications Commission(FCC) warned of spectrum crisis: because our mobile devices are so data- hungry we will soon run out of radio-frequency bandwidth.Li-Fi could free up bandwidth, especially as much of the infrastructure is already in place."There are around14 billion light bulbs worldwide, they just need to replaced with LED ones that transmit data", says Haas. The idea of transmitting data through the visible light spectrum is not new.Alexander Graham Bell transmitted sound via a beam of sunlight in 1880 using a photo phone, a sort of solar-powered wireless telephone. In the past several decades, a number of researchers have looked at using visible light to transmit data. But what Haas seized on is the use of simple LED light bulbs for data transmission. LED bulbs are controlled by a driver, which can rapidly di the light or turn it on or off. Therefore, Haas figured, data could be encoded in subtle shifts of the light's brightness. Eventually, he creaded a working transmitter and receiver system with an IKEA lamp and a solar panel. Li-Fi stands to be much faster than Wi-Fi. According to Haas research, Li-Fi can achieve data density 1000 times greater than Wi-Fi,because Li-Fi signals are contained in a small area, as opposed to the more diffuse ,radio signals.The system wouldn't mean having to keep your lights on all the time either, Haas... Question: By saying "There are around14 billion light bulbs worldwide"Haas intended to tell us that _ Options: A: mobile devices will consume more data B: radio-frequency bandwidth needs to be freed up. C: VLC might solve the spectum crisis. D: the world has a complete lighting infrastructure.
C

I'm taking a test and have to guess the right answer to the question after the article. Article: Those who are used to looking through thousands of books in big bookstores may find Japan's Morioka Shoten a little strange. That's because this tiny bookstore that is located in Ginza, Tokyo sells only a single book at a time. Opened in May 2015, Morioka Shoten is the brainchild of Yoshiyuki Morioka. The experienced bookseller began his career as a bookstore clerk in Tokyo's Kanda district before branching out to open his own store. It was here while organizing book readings that he realized that customers usually came into the store with one title in mind. Morioka began to wonder if a store could exist by selling many copies of just one single book. In November 2014, he partnered with his two friends, to establish a unique bookstore with the idea of "A Single Room, A Single Book." Like its offering, the bookstore is simple. The selections that are picked by Morioka change weekly and vary widely to attract customers with different interests. Recent choices include The True Deceiver, an award-winning Swedish novel by Tove Jansson, Hans Christian Andersen's Fairy Tales, and a collection of artist Karl Blossfeldt's photography of plants. Morioka has also chosen books written by famous Japanese authors Mimei Ogawa and Akito Akagi. To highlight his only offering, Morioka often uses clever methods. For example,when selling a book about flowers, he decorated his shop with the ones that had been mentioned in the book. He also encourages authors to hold talks and discussions so they can connect with customers. Morioka says his goal is for the customers to experience being inside a book, not just a bookstore! Risky as the idea might seem, things appear to be going well. Morioka says he has sold over 2,100 books since he opened it. Things can get better considering that his bookstore is becoming increasingly popular not just among the locals but also visitors from other countries. Question: What inspired Morioka to open such a bookstore? Options: A: A Swedish novel B: His present partner C: A bookstore clerk D: His working experience
D