Read the article and select the best answer. Article: I love online shopping, but for years I did all my shopping offline since I wasn't sure if it is really safe to buy online. In the last few years I started buying almost everything online after I understood that buying online can be safer than buying offline as long as you follow a few safety rules. Check for delivery times--If you need your product on a certain time--you'll have to make sure if the site you are referring to is committed to your schedule. Compare prices before you buy--There are many comparison sites and tools (such as PriceGong) that compare prices--this can save you a lot of money. Don't leave the computer unsupervised while shopping online--You don't want that someone else will touch anything by mistake and will make the purchase. Make sure you can contact the store if something goes wrong--You want to make sure that you will have someone to talk with if something goes wrong. Always print out your order details and confirmation--Just in case that you'd need to contact the site, it is always better to give them detailed information about your order. Make sure you buy from a well-known merchant--or check how others rated this merchant, there are some rubbish sites and you don't want to buy from them. If you use _ --use the merchant ratings, product ratings and product description to know that you are buying the right product at the right store. Question: Which of the following is included in the writer's suggestions? Options: A: Don't buy things from those rated low. B: Print what you want before shopping online. C: Contact the store as often as possible when shopping online. D: Shut off computers after you have finished shopping online.
A

Read the article and select the best answer. Article: Every summer, no matter how urgent work schedule is, I take off one day exclusively for my son. We call it dad-son day. This year our third stop was the amusement panic, where we discovered that he was tall enough to ride one of the fastest roller coasters in the world. We experienced through face-stretching turns and circles for ninety seconds. Then, as we stepped off the ride, in a calm voice, he remarked that it was not as exciting as other rides he'd been on. As I listened, I began to sense something seriously out of balance. Throughout the season, I noticed similar events all around me. Parents found it hard to find new stimulations for cold kids. Surrounded by ever-greater stimulation, their young feces were looking disappointed and bored Facing their children's complaints of "nothing to do", parents were spending large numbers of dollars for various forms of entertainment In many cases the money seemed to do little more than buy relief from the terrible complaint of their bored children. This set me thinking the obvious question: "How can it be so hard for kids to find something to do when there's been such a range of stimulating entertainment available to them?" What really worries me is the strength of the stimulation. I watch my little daughter's &ce as she absorbs bloody special effects in movies. Why do children facing such excitement seem starved for more? Thai was, I realized, the point I discovered during my own adolescence that what creates excitement is not going fast, but going faster. Excitement has less to do with speed than changes in speed. I am concerned about the increasing effect of years at these levels of feverish activity. It is no mystery to me why many teenagers appear uninterested and burned out, with a "been there, done that" air of indifference toward much of life. As increasing numbers of friends' children are advised to take medicine to deal with inattentiveness at school or anti-depressants to help with the loss of interest and joy in their lives--I question the role of... Question: In order to relieve children's boredom, the author would probably suggest _ . Options: A: adjusting the pace of life and strength of stimulation B: promoting the practice of dad-son days C: consulting a specialist in child psychology D: balancing school work with after school activities
A

Q: Read the article and select the best answer. Article: Scientists have proved that sleeping and learning go hand in hand. Even a short nap can boost our memory and sharpen our thinking. But the relationship goes deeper than that. "The brain is not passive while you sleep," scientist Anat Arzi said. "It's quite active. You can do many things while you are asleep." Arzi and her coworkers didn't try to teach the sleeping volunteers any complex information, like new words or facts. Instead, the scientists taught volunteers to make new connections between smells and sounds. When we smell something good, like a flower, we take deep breaths. When we smell something bad, we take short breaths. Arzi and her co-workers based their experiment on these reactions. Once the volunteers fell asleep in the lab, the scientists went to work. They gave them a whiff of something pleasant and meanwhile played a particular musical note. They didn't wake up, but they heard--and sniffed deeply. Then the scientists gave the volunteers a whiff of something terrible and played a different musical note. Again, the volunteers heard and smelled--a short snort this time--but didn't wake up. The researchers repeated the experiment. After just four repetitions, volunteers made a connection between the musical notes and their paired smells. When the scientists played the musical tone that went with good smells, the sleepers breathed deeply. And when the scientists played the musical tone that went with bad smells, the sleepers breathed briefly--despite there being no bad smell. The next day, the volunteers woke up with the sound-smell connection. They breathed deeply when hearing one tone and cut their breaths short when hearing the other, which must have been unusual for them. Imagine walking down the street and taking a deep breath upon hearing a particular sound! Question: In the study, the volunteers were taught _ . Options: A: to become active during sleep B: to tell the difference between smell C: to learn new words and scientific facts D: to make sound-smell connections
A: D

Q: Read the article and select the best answer. Article: Imagine this: you get up in the morning and put on a custom printed T-shirt. Then you eat some 3-D printed food and relax on your printed sofa. Perhaps you take a ride in a printed electric car to the hospital to get a printed tooth fitted. Though some of these things may seem impossible, they're closer to reality than you might think. The world of 3-D printing is coming to a store near you soon. The idea of 3-D printing is to produce complicated shapes in a very personalized way. If you want to make a totally new object, you need to make a virtual design in a CAD(computer aided design)file first. Or you can use a 3-D scanner to make a digital copy of an object. Then, based on the design or copy, the 3-D printer makes paper-thin slices out of liquid, plastic, or metal and puts them together to create the object you want. There are many areas in which 3-D printing can change our lives. One such area is health care. Researchers have developed simple 3-D printed organs, which can be used in life-saving operations. A 17-year-old boy in the US has also recently developed a brain-powered, 3-D printed replacement hand. From heart monitors to fake limbs , we can soon be living longer thanks to 3-D printed technology. Another area that 3-D technology looks sure to change is food. Can you imagine being able to print your favorite dishes at home at the touch of a button? Even big companies are behind the trend. Hersheys, one of the largest chocolate makers in the world, recently announced that it would start producing chocolate with the help of 3-D printers. NASA, the US space agency, has reportedly spent $125,000 (767,594 yuan) developing a "3-D pizza printer". It is not yet clear how long it will take until 3-D printers are available to everyone. But one thing is for sure: the possibilities are endless. Question: Compared with traditional manufacturing procedures, 3-D printing _ . Options: A: isn't practical in daily life B: relies less heavily on the use of 3-D scanners C: can produce complicated products in larger sizes or numbers D: has an advantage in meeting the personal needs
A: D