As a man {#blank#}1{#/blank#} (pass) the elephants, he suddenly stopped, confused by the fact that these huge creatures were being held by only a small rope {#blank#}2{#/blank#} (tie) to their front leg. No chains, no cages. It was obvious that the elephants could, at any time, break away from their bonds, {#blank#}3{#/blank#} for some reason, they did not.

    He saw a trainer nearby and asked why these animals just stood there and made no attempt {#blank#}4{#/blank#} (get) away. "Well," the trainer said, "when they are very young and much {#blank#}5{#/blank#} (small) we use the same size rope to tie them and, at that age, {#blank#}6{#/blank#} is enough to hold them. As they grow up, they are conditioned to believe they cannot break away. They believe {#blank#}7{#/blank#} rope can still hold them, so they never try."

    The man was amazed. These animals could at any time break free from their bonds but because they believed they couldn't, they were {#blank#}8{#/blank#} (stick) right where they were.

    Like the elephants, how many of us go through life {#blank#}9{#/blank#} (hang) onto a belief that we cannot do something, {#blank#}10{#/blank#} (simple) because we failed at it once before?

    Failure is part of learning; we should never give up the struggle in life.

    Chris is not a traditional explorer— he usually {#blank#}1{#/blank#} (work) in an office for a large organization. However, Chris' job can be just {#blank#}2{#/blank#} exciting and dangerous as being an explorer.

    Chris is a doctor from France and he works for MSF,{#blank#}3{#/blank#} is also known as Doctors Without Borders. MSF sends its doctors all over the world {#blank#}4{#/blank#}(help) people after a war or a disaster. The organization received the Nobel Peace Prize in 1999.

    At the moment, there are over 27,000 trained doctors taking part in MSF projects and tasks. This year, more than 2300 international doctors will join {#blank#}5{#/blank#} (they) to provide medical help around the world. All kinds of doctors can volunteer for MSF. They need to be {#blank#}6{#/blank#} (prepare) to go almost anywhere and, of course, they should expect difficult conditions. When MSF accepts a doctor for a task, he has to go for {#blank#}7{#/blank#} least six months.

    When {#blank#}8{#/blank#} (ask) why he left a comfortable life and a good salary to join MSF, Chris said, “The experience I gain is a great help in my career. More {#blank#}9{#/blank#} (important), it is great to know at the end of each task that I have made a real {#blank#}10{#/blank#} (different) to people's lives.”

    Have you ever wondered{#blank#}1{#/blank#}children always seem to have bas of energy and never run out of steam? Researchers have discovered that children have levels of recovery of endurance athletes. In fact, scientists say children's muscles recover from "high-intensity exercise" a lot {#blank#}2{#/blank#}(quick)than athletes. A study looked at the performance levels of children when they were cycling, and compared their fitness to {#blank#}3{#/blank#} of athletes. Rwsearcher Dr Sebastien Ratel suggested they{#blank#}4{#/blank#}(find)the children used more of their aerobic metabolism and were therefore less tired during the high-intensity physical activities. The children also recovered very quickly—even faster than the well-trained adult endurance athletes.

    The researchers hope that{#blank#}5{#/blank#}(they)finding will help scientists have a better {#blank#}6{#/blank#}(understand) of how the human body changes with age. It could lead to advantages in the fight{#blank#}7{#/blank#}diabetes and other diseases. Dr Ratel said the research was{#blank#}8{#/blank#}(particular)important as more children were become less active. He warned." With the diseases related to physical inactivity{#blank#}9{#/blank#}(rise), know the changes with growth that might contribute to the risk of disease."{#blank#}10{#/blank#}is helpful for children to maintain their fitness as they grow up and play as much as they could so they renin healthy as adults.

Temperatures around the world are rising. Many places {#blank#}1{#/blank#}(experience) extreme weather events such as extreme heat since the start of the new century.

Scientists have shown all that is going to get even {#blank#}2{#/blank#} (bad). They looked at cities in the north half of the planet. They {#blank#}3{#/blank#} (especial) paid attention to those in the US.

According {#blank#}4{#/blank#} simple geography, the cities near Canada have cool to mild weather. Those near Mexico {#blank#}5{#/blank#} (be) hotter and more humid(潮湿的). However, things are going to look and feel a lot different in 2080.

The scientists created a weather model {#blank#}6{#/blank#} (study) the weather changes in 2080. They considered two important points. One was the warming of the planet by 1.5℃ to 3℃ and{#blank#}7{#/blank#} other was the increasing greenhouse gas levels. Unluckily, what the scientists found was {#blank#}8{#/blank#} (surprise)! The cities in the north turned into ones in the south— about 500 {#blank#}9{#/blank#}(mile) south. For example, Washington, DC felt like Greenwood, Mississippi，and Mississippi felt like Mexico.

That's bad news for people in the US, {#blank#}10{#/blank#} it's also bad for people everywhere because we're all in the same boat.