Recently, online hike-sharing has become the new favorite in China. In major cities, bikes in, yellow, orange, blue, white and green, can be seen almost everywhere on the street. It seems that these bikes appeared suddenly, adding a new beautiful scenery to Chinese cities.

    Both the market and the public welcome online bike-sharing, but is it really a promising business? Well, it depends. After all, online bike-sharing platforms can never get away with huge operating cost and uncertain government policy.

    Some theorists might say that online bike-sharing platforms can earn a fortune simply through deposit. Since users will always need to rent bikes, their deposit will always be kept to online bike-sharing platforms.

    However，although online bike-sharing platforms may be able to use the deposit for other purposes at the primary stage, they will have to set up a special account, so that the deposit shall be used specially for its designated (指定的) purpose. As the market gets increasingly mature, they will have to do so whether to be responsible for users or in consideration of possible government regulations.

    Now that online hike-sharing platforms can，t make profit through deposit，how can they become profitable as fiercer market unfolds? Although Hu Weiwei, CEO of Mobike, stated in an article that she would take Mobike as charitable(慈善的) project if she failed, running a startup is absolutely different from managing a charity organization. After all , she has to pay back investors' billions of investment(投资).

    To make profit, online bike-sharing platforms might have toincrease rent fee for each trip, just as Didi did

    From this aspect, it might be a really good business. If we consider full screen ads fee, recommendation fee for business owners, etc. , its annual income might reach at least RMB 15 billion. If we consider the huge operation cost, including bike repairs，bikes' service life and labor cost, there might not be much net profit left. After all, offline operation cost has always been an unbearable burden for such internet plus mode-based startups.

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    If you were like most kids, your mother told you there were three no-no's when it came to your fingers: Don't put them in an electrical outlet, don't stick them up your nose ( at least not in public ), and don't use them when you are counting.{#blank#}1{#/blank#}But experts in education and cognition now believe that using your fingers to do math is not only a perfectly good idea but may even help children become superior students.

    It certainly makes sense. When children count on their fingers, they take an abstract concept— mathematics—and translate it into the most basic and visual form.{#blank#}2{#/blank#} Even when we aren't actually counting on them, they still can help us on math problem,

    {#blank#}3{#/blank#}It activates when we respond to heat, pressure, pain, or the use of a given finger. Studying brain scans, researchers discovered that when students aged 8 to 13 work on subtraction (减法) equations, this region “lights up” on the scans, even if the students aren't using their fingers. The more complex the problem, the more activities are detected.

    The connection between finger use and math ability has been shown on old-fashioned math tests as well. With their eyes closed, first graders were asked to identify which of their fingers a researcher was touching,{#blank#}4{#/blank#}When college students were given the same quiz, the highest scores once again performed best on calculation tests.

    So what does all this mean? For one thing, parents and teachers shouldn't discourage children from counting on their fingers.{#blank#}5{#/blank#}Memorizing the multiplication tables may help, but it is not the best option. “I would like to see interesting and creative representations of ideas.” says Jo Boaler, a professor of math education.

    Recently, a series of activities have been designed to strengthen students' perception of their fingers. Maybe in the near future, there will be only two no-no ¹s regarding the use of fingers.

A. The first two laws of fingers are as true as ever.

B. There is a section of the brain, called the somatosensory finger area.

C. Researchers also stress that students simply learn better using visual tools.

D. Researchers are unimpressed by those students who finish quickly as well.

E. In fact, experts believe the brain is able to “see” a representation of our fingers.

F. That may sound simplistic, but the researchers offer an interesting explanation.

G. Researchers found those scoring highest on the finger-ID questions scored higher on a math test.

    Our character, basically, is made up of our habits. "Sow a habit, reap (收获) a character: sow a character reap a destiny (命运)," as the saying goes.

    {#blank#}1{#/blank#}Because they are often unconscious patterns, they constantly daily affect our character and produce our effectiveness or ineffectiveness.

    As Horace Mann, the great educator, once said, "Hahits are like a cable. We weave a rope of it every day and soon it cannot be broken. "Habits can be learned. But we know it isn't a quick fix.{#blank#}2{#/blank#}

    Many of us have watched the lunar voyage of Apollo 11.{#blank#}3{#/blank#}But to get there, those astronauts had to break out of the tremendous gravity pull of the earth. More energy was spent in the first few minutes of lift-off, than was used over the next several days to travel half million miles.

    {#blank#}4{#/blank#}Getting rid of bad habits really requires great willpower and some changes in our lives. Lift-off takes tremendous effort, but once we break out of the pull of gravity, we can enjoy great freedom.

    Like any natural force, gravity pull can work with us or against us. The gravity pull of some of our habits may currently be keeping us from going where we want to go. But it is also gravity pull that keeps our world together and keeps the planets in their orbits.{#blank#}5{#/blank#}We can use the gravity pull of habit to create the order necessary to establish effectiveness in our lives.

A. It involves a process and a great effort.

B. Habits are powerful factors in our lives.

C. Habits, too, have tremendous gravity pull.

D. It is a powerful force if we use it effectively.

E. We should try our best to get rid of our bad habits.

F. To break out of the pull of gravity needs great efforts.

G. We were surprised to see the first men walk on the moon.

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    It's difficult to know the exact answer to whether babies dream and what they dream about. However, sleep experts have shown that newborns dream the most in the first two weeks after birth. Babies spend most of their sleeping time in REM(rapid eye movement) stage. As dreaming takes place in a light state of sleep, newborns tend to wake up due to noises, movements and other factors. When dreaming, newborns make a few noises and their eyes move. They may move around the sides or up and down. They may laugh, scream, or cry during the REM sleep. Also, their facial muscles, hands, and legs move, due to which they may wake up. So wrapping a baby in swaddling(裹紧的) clothes can keep the baby's body from moving and help them sleep better. As babies grow, their body movement decreases when dreaming.

    Studies say that the brain activity associated with dreaming is essential for the babies' mental development. During the REM stage, the flow of blood to the brain increases. As a result, certain nerve proteins are produced, which are the building units of the brain. Babies get stimulation from what they see, hear, or feel. The brain processes the information acquired while awake, and stores what is essential to the individual. A study concludes that babies learned while they were dreaming.

    What's the time for babies to start dreaming? Researchers say that before birth, babies start experiencing REM sleep around week 25, and so they may start dreaming at the point. On the contrary, some psychologists believe that children start having dreams when they are about 5 years old. At that age, they start becoming aware of themselves and begin to understand the things around them, which is what dreams are actually made of.

    Sweet potato plants don't have spines or poisons to defend themselves. But some have evolved a clever way to let hungry herbivores (食草动物) know they aren't an all-you-can-eat buffet, a new study finds. When one leaf injured, it produces a chemical that warms the rest of the plant and its neighbors to make themselves inedible (不宜食用的)to bugs. Sweet potato breeders could potentially engineer plants to produce the chemical as an all-natural pest defense.

    Plant ecologists led by Axel Mithofer of the Max Planck Institute for Chemical Ecology in Jena, Germany, started to look into sweet potato (Ipomoea batatas) defenses after they noticed something interesting about two varieties of the plant grown in Taiwan: The yellow-skinned, yellow-fleshed Tainong 57 is generally herbivore-resistant, but its darker orange cousin, Tainong 66, is plagued (造成麻烦) by insect pests.

    To find out why, the team offered up Tainong 57 and 66 plants to hungry African cotton leafworm caterpillars (毛虫).Both plants released at least 40 airborne compounds as the caterpillars snacked on their leaves. But Tainong 57 produced a lot more of a chemical called DMNT, which has a very distinct smell, the team details this month in Scientific Reports. ("The smell is not nice," Mithofer says. "You wouldn't want it as a perfume.")

    DMNT isn't a new compound; researchers have isolated (分离出) the smelly chemical from other plants such as corn and cabbage, and it is known to induce defense responses in some species.

    To determine whether this was happening in sweet potatoes, scientists set up two experiments. First, they put two plants next to each other and wounded one so it produced DMNT. Then, they exposed healthy Tainong 57 plants to DMNT they had synthesized (合成).In both cases, the DMNT caused the exposed plants to produce more of a protein called sporamin in their leaves. (Tainong 66 did not have the same reaction.) When the caterpillar's snack on sporamin, "they immediately stop eating because they don't feel well," Mithofer says.

    Sporamin is the main protein in sweet potato tubers (块茎),and is indigestible raw, which is why sweet potatoes must be cooked for humans to enjoy them. "If the caterpillars could cook it, they could eat it," Mithofer says. Theoretically, he says, sweet potato breeders could use genetic engineering to make different varieties of sweet potato produce as much DMNT as Tainong 57, and display the same defense responses.

    Still, the research isn't ready for prime time, cautions plant ecologist Martin Heil. DMNT might work in the lab, but in the field, airborne chemicals can be "blown away in seconds," says Heil, who studies plant-insect interactions at the National Polytechnic Institute in Irapuato, Mexico.

    Mithofer himself has no plans now to create genetically engineered sweet potato plants, because they would not be a viable (能活下去的) crop in Europe, where genetically modified crops are outlawed. So for now, Tainong 66 will have to put up with being a caterpillar salad bar.