We usually think that plants always stay quiet and never speak. Grass doesn't cry when you cut it; flowers don't shout when they're picked. But this view of the world couldn't be more wrong. Plants talk to each other all the time. Their language is one of chemicals.

    Over the years, scientists have found that different types of plants, from trees to tomatoes, send compounds(复合物)into the air to help neighboring plants. But exactly how plants receive and act on many of these signals is still a mystery.

    Scientists from Kyoto University in Japan looked at tomato plants that had been bitten by insects. To start out, they grew plants in two plastic bags connected by a tube(管子). One plant had been bitten by insects. The other was not bitten.

    They found that when insects bite plant leaves, the plants don't sit quietly. They send a chemical called "hexvic" into the air. Humans can't notice it, but these chemicals carry a smell that neighboring plants can notice. This way, neighboring plants realize the danger and begin to give off more "hexvic" to protect themselves.

    The same scientists continued their research by placing insects on the plants that had not been bitten. The plants were able to kill nearly 50 percent of the invaders, much more than their neighbor.

    It was surprising that the plants that had not been bitten didn't send the chemical until the received a warning message from their infested(受侵的)neighbor, the scientists said. These findings could be used to help farmers with the control of the insects which do harm to their plants.

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2. 文中不能出现真实的人名和校名。

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How can we become good language learners? 

What makes a good language learner?  There are some things that good language learners do and some things they don't do. 

Don't forget that it's never too late to become a good language learner. 

"Rock, paper and scissors" is a typical game which gave us {#blank#}1{#/blank#} memory in our childhood. It is said that people played it widely 2,000 years ago in China. Today, people play it {#blank#}2{#/blank#} the world. In Indonesia, it's known as"ant, person, elephant". People in Singapore play"bird, stone, water". People use different hand {#blank#}3{#/blank#} in different countries. But the instruction of the game is the same all over the world.

 Many people think"rock, paper, scissors" is all about luck. But the game is not {#blank#}4{#/blank#} accidental. A 2014 study in China {#blank#}5{#/blank#} two key patterns in the way people played. The fact is that the winner always repeat his winning hand gestures.

 So what's the best way to win this game? Expert players not only think about their next move, but also what their players' next move might be.

Good afternoon, I am Mike. Here is the map {#blank#}1{#/blank#} my school. It is not a very big school. It has 600 students. There {#blank#}2{#/blank#}twenty boys and fifteen girls in my class. My classroom is next to the head {#blank#}3{#/blank#} (teacher) office. 

{#blank#}4{#/blank#} is the office building? Oh, it is between the classroom building {#blank#}5{#/blank#} the gym. Near the classroom building there is the big library and the dining hall. {#blank#}6{#/blank#}lot of students have lunch in the dining hall. The computer room is next to the science lab. We{#blank#}7{#/blank#} (not have) classes in the science lab but we go to the computer room on Wednesdays for computer {#blank#}8{#/blank#} (lesson). I like computers. 

After school, we play on the sports fields. My friend Tony always {#blank#}9{#/blank#} (play) football. He is in the school football team. I am in the school basketball team. We play basketball in the gym. I like {#blank#}10{#/blank#} (I) school.