下列说法正确的是（　　）

感冒时鼻塞、呼吸不畅，原因是（　　）

嫁接成活的关键是接穗与砧木的{#blank#}1{#/blank#}紧密结合，这样才容易成活．

嫁接成活的关键是接穗与砧木的{#blank#}1{#/blank#}紧密结合，这样才容易成活．

    My mom only had one eye. I hated her... she was such an embarrassment. My mom ran a small shop at a flea market. She collected little weeds and such to sell... anything for the money we needed she was such an embarrassment. There was this one day during elementary school.

    I remember that it was field day, and my mom came. I was so embarrassed. How could she do this to me? I threw her a hateful look and ran out. The next day at school... “Your mom only has one eye?!” and they taunted me.

    I wished that my mom would just disappear from this world so I said to my mom. “Why don’t you just die?” My mom did not respond. I guess I felt a little bad, but at the same time, it felt good to think that I had said what I’d wanted to say all this time. Maybe it was because my mom hadn’t punished me, but I didn’t think that I had hurt her feelings very badly.

    That night... I woke up, and went to the kitchen to get a glass of water. My mom was crying there, so quietly, as if she was afraid that she might wake me. I hated my mother who was crying out of her one eye. So I told myself that I would grow up and become successful, because I hated my one-eyed mom and our desperate poverty.

    Then I studied really hard. I left my mother and came to Seoul and studied, and got accepted in the Seoul University with all the confidence I had. Then, I got married. I bought a house of my own. Then I had kids, too. Now I’m living happily as a successful man. I like it here because it’s a place that doesn’t remind me of my mom.

    This happiness was getting bigger and bigger, when someone unexpected came to see me “What?! Who’s this?!” It was my mother... Still wither one eye. It felt as if the whole sky was falling apart on me. My little girl ran away, scared of my mom’s eye.

    And I asked her, “Who are you? I don’t know you!!” as if I tried to make that real. I screamed at her “How dare you come to my house and scare my daughter! Get out of here now!!” And to this, my mother quietly answered, “oh, I’m so sorry. I may have gotten the wrong address,” and she disappeared. Thank goodness... she doesn’t recognize me. I was quite relieved. I told myself that I wasn’t going to care, or think about this for the rest of my life.

    Then a wave of relief came upon me... one day, a letter regarding a school reunion came to my house. I lied to my wife saying that I was going on a business trip. After the reunion, I went down to the old shack, that I used to call a house, just out of curiosity there, I found my mother fallen on the cold ground. She had a piece of paper in her hand. It was a letter to me.

She wrote:

    My son, I think my life has been long enough now. For you... I’m sorry that I only have one eye, and I was an embarrassment for you. You see, when you were very little, you got into an accident, and lost your eye. As a mother, I couldn't stand watching you having to grow up with only one eye… so I gave you mine... I was so proud of my son that was seeing a whole new world for me, in my place, with that eye. I was never upset at you for anything you did. The couple times that you were angry with me I thought to myself, ‘it’s because he loves me.’ I miss you so much. I love you. You mean the world to me. So I gave you mine. With all my love to you! Your mom.

    My World Shattered. I hated the person who only lived for me. I cried for My Mother, I didn’t know of any way that will make up for my worst deeds...

    You are sitting on the desk. A teacher is writing on the blackboard. Kids are yelling in the playground outside. A book falls off the desk next to you. Suddenly, the teacher hands you a pop quiz.

    Don’t panic! {#blank#}1{#/blank#} You're in a “virtual（虚拟的）classroom”. Everything you see and hear is coming to you through a computer-operated display that you’re wearing on your head like a pair of very big glasses. Wearing this kind of virtual-reality equipment, you can find yourself sitting in a classroom, touring a famous museum, wandering across a strange landscape, flying into space, or playing with a cartoon character. {#blank#}2{#/blank#} Virtual-reality equipment that delivers images and sounds directly to your eyes and ears makes these fake worlds seem lifelike.

    Unlike the classroom, the technology is real. It’s a type of technology that uses computer programs to imitate real world situation.{#blank#}3{#/blank#} Movie directors and video game producers have been using computers for years to create ever more realistic special effects. Some companies are now building three-dimensional（三维）fantasy worlds in which players, linked by computer networks, appear to meet and go on explorations together.

    {#blank#}4{#/blank#} They see virtual reality technology as a useful tool for learning more about why people act as they do. It could help psychologists deter identify and come up with solutions for behaviors problems, for example.

“We’ve spent the last 100 years looking for certain laws in how people interact with the real world,” says psychologist Albert. “ {#blank#}5{#/blank#} This is psychologist’s dream.”

    You are sitting on the desk. A teacher is writing on the blackboard. Kids are yelling in the playground outside. A book falls off the desk next to you. Suddenly, the teacher hands you a pop quiz.

    Don’t panic! {#blank#}1{#/blank#} You're in a “virtual（虚拟的）classroom”. Everything you see and hear is coming to you through a computer-operated display that you’re wearing on your head like a pair of very big glasses. Wearing this kind of virtual-reality equipment, you can find yourself sitting in a classroom, touring a famous museum, wandering across a strange landscape, flying into space, or playing with a cartoon character. {#blank#}2{#/blank#} Virtual-reality equipment that delivers images and sounds directly to your eyes and ears makes these fake worlds seem lifelike.

    Unlike the classroom, the technology is real. It’s a type of technology that uses computer programs to imitate real world situation.{#blank#}3{#/blank#} Movie directors and video game producers have been using computers for years to create ever more realistic special effects. Some companies are now building three-dimensional（三维）fantasy worlds in which players, linked by computer networks, appear to meet and go on explorations together.

    {#blank#}4{#/blank#} They see virtual reality technology as a useful tool for learning more about why people act as they do. It could help psychologists deter identify and come up with solutions for behaviors problems, for example.

“We’ve spent the last 100 years looking for certain laws in how people interact with the real world,” says psychologist Albert. “ {#blank#}5{#/blank#} This is psychologist’s dream.”