Beijing was once a city of bikes, known as the Bicycle Kingdom{#blank#}1{#/blank#} cars were reserved for official business and the politically powerful. However, decades of economic{#blank#}2{#/blank#} (grow) led to a huge flowing of cars in the city. Owning one became not just a marker of reaching the middle class but also a requirement for marriage. As the economy developed, autos pushed bikes off the roads{#blank#}3{#/blank#} (create) heavy pollution and miserable traffic.

    {#blank#}4{#/blank#}(fortunate), now Beijing may he returning to its roots. Thanks to about 20 technology companies, brightly colored shared bikes {#blank#}5{#/blank#}(flood) into Beijing in the last two years. Many local residents welcome the shared bikes{#blank#}6{#/blank#}the flexibility and freedom they offer. They pick up the bikes and then ride and drop{#blank#}7{#/blank#} off anywhere they like, locking the back wheel, with no need to find a fixed place.

    Analyses in China say it is three factors that contribute to bikes {#blank#}8{#/blank#}(increase) rapidly: a lot of cash looking for a home, a good idea and government support. “As the city s population grew, traffic jams got {#blank#}9{#/blank#} (bad).” Cai, the Ofo spokeswoman, said, “Shared bikes could solve the 'last mile' problem in {#blank#}10{#/blank#} environmentally friendly way.”

    The sun at the center of our Solar System is one of the big reasons for{#blank#}1{#/blank#}we're here today, but it can also be a big trouble from time to time. Coronal mass ejections(CMEs) (日冕物质喷发)can seriously damage human{#blank#}2{#/blank#}(communicate) systems.

    For years, researchers{#blank#}3{#/blank#}(attempt) to forecast and predict CMEs in {#blank#}4{#/blank#}hope that warnings could help prevent damage to electronics and the power grid (电网). As it turns{#blank#}5{#/blank#}that a CME is more like a sneeze. Professor Mathew Owens of the University of Reading explains, "The research team and I have found they are more like an{#blank#}6{#/blank#}(expand) dust cloud or sneeze."

    When the solar wind acts on the CME as it moves through space, it causes the shape and behavior of the energy explosion {#blank#}7{#/blank#}(become) unpredictable. "Therefore if we want to protect{#blank#}8{#/blank#} (we) from solar eruptions, we need to understand more about the solar wind, "Owens says.

    The research team suggests that solar wind readings should {#blank#}9{#/blank#} (include) in the forecasting and prediction of future CMEs. This study could help scientists more{#blank#}10{#/blank#}(accurate) assess the risk that the ejections bring to human technology and potentially help reduce the damage they cause.

To Be Joyful, To Be Young

    What really works to make sustainable changes in diet and lifestyle? It's probably not what you think. In the past 30 years of conducting clinical research, I {#blank#}1{#/blank#} (learn) that real keys are pleasure, joy and freedom. Why? Because life is to be enjoyed. There's no point {#blank#}2{#/blank#} (abandon) something you enjoy unless you get something back that's even better, and quickly. When people eat more healthfully, quit smoking, and manage stress better, they find they feel so much better, so quickly. {#blank#}3{#/blank#} you exercise and eat right, your brain{#blank#}4{#/blank#} (receive) more blood flow and oxygen, so you become smarter, have more energy, and need less sleep. Two studies showed just walking for three hours per week for only three months caused so many neurons {#blank#}5{#/blank#} (grow) that it actually increased {#blank#}6{#/blank#} size of people's brains! Your face receives more blood flow, so your skin glows more and wrinkles less. You look younger and {#blank#}7{#/blank#} attractive. In contrast, an {#blank#}8{#/blank#} (health) die and smoking speeds up aging because nicotine contributes {#blank#}9{#/blank#} your blood vessel becoming narrower, {#blank#}10{#/blank#}decreases blood flow to your face and makes it wrinkle prematurely.

    Wallace's giant bee is the world's {#blank#}1{#/blank#} (large) bee, with a body the size of a human thumb and wings that can spread to about 2.5 inches. That may sound {#blank#}2{#/blank#} (frighten), but the bee isn't likely to hurt anyone. It uses its large jaws (嘴) to collect a sticky goo, called resin, from trees. The bee {#blank#}3{#/blank#} (make) its home in termite mounds (白蚁丘) found on trees, using the resin to protect its nest from the termites. Until recently, the bee had been seen by scientists only {#blank#}4{#/blank#} (two), once in 1868 and again in 1981.

    The 2012 Olympic and Paralympic (残奥会)Games brought the world's attention to sport like never before. It was admirable {#blank#}1{#/blank#}(see) a small nation like the UK organize the Olympic for {#blank#}2{#/blank#} third time in modern history.

    Britain probably {#blank#}3{#/blank#}(invent) quite a few modern sports. One is cricket (板球), {#blank#}4{#/blank#} is now played at international level in a dozen countries. Tennis also first became popular here and Wimbledon is one of the four big tournaments every year. Golf{#blank#}5{#/blank#} (suppose) to be Scottish in origin (起源)from a school of the same name.

    Every town in Britain has football, rugby or cricket club (sometimes all three) and at least one swimming pool. Schools have a gymnasium and playing fields with a running track. As British is an island, there are lots of opportunities for practising water sports {#blank#}6{#/blank#} well.

    "Fair play" in British society is as important as {#blank#}7{#/blank#} (win) or losing. Teamwork is also necessary in many areas of professional life. Even so, individualism (个性)and competitiveness make sporting champions. Steve Redgrave, winner of five gold {#blank#}8{#/blank#}(medal) at five Olympic Games, says: "Being {#blank#}9{#/blank#} (confidence)in yourself is the most important in sporting success. {#blank#}10{#/blank#}(personal), it is the iron in the mind not the supplements (增补物）that wins medals."