It's quiet at night. I toss and turn in bed and can't sleep. The clock hanging on the wall is ticking away. Suddenly, a gentle voice sounded: "Children of 2 1 century, children of 2 1 century, please answer …" The continuous voice floated in the room like a ghost. My heart suddenly shrank. Who are you? Who are you? Is it a thief? Is it a ghost? I crawled back and forth in the room, looking for the sound coming from there; I forced myself to calm my excitement and listen attentively. "oh! Oh, my God! The clock is shining? Yes ... but this is not a clock! Is that the vast and starry universe I have seen on TV? I can't help secretly surprised. Covered with faint moonlight, I gently moved to a small bench, stood up, and got close to the luminous body … closer, closer. I looked at the luminous image on the wall with fascination. How beautiful! My hand involuntarily raised and touched it. " Ah! The image became my body ... "I was sucked in by the image before I could think.

"Why, isn't this the universe?" I was surprised and looked around at many colorful tunnels. Just as I was watching, there was a loud bang, and a monster appeared in front of me: a green body covered with prickles like cactus, big black eyes and a pair of thin film wings. I almost fainted when I looked at it. It came to me step by step, opening its mouth wide, and its black fangs were daunting. Will it eat me? Or bring me back to their planet as a specimen like in science fiction ... The more I think about it, the more scared I am, shaking all over, and shrinking back step by step. "Stand still, children, I won't hurt you." Its language is actually Chinese, yes, the same as ours. Its voice is so amiable that it enters my heart like a warm current. "Who are you?" I still have a lingering fear. "I am a human in 4099! What? People, too! ? I can't believe it. I rubbed my eyes hard. " You are a 2 1 century human! ""yes. But you say you are human, why do you look like this ... no, is it? " "alas! This is all caused by the harsh environment. In order to adapt to the tyrannical and unpredictable weather, we have to use science and technology to transform and transform ourselves ... just look at the crystal screen! " The voice just fell and the tunnel next to us changed. In front of us is a dense virgin forest, and a few archaeopteryx, which can only be seen in the picture, are calling among the winding towering trees in Gu Teng. Everywhere is so beautiful, green mountains and trees, clear water and blue sky, showing a vibrant scene. Then, the screen changed again, and a dark scene came into view: "Go! Kill ... "The avalanche of shouting ShaSheng sounded; Subsequently, a large group of ancient China soldiers with long braids came to kill with old rifles; Black fireworks filled the whole battlefield. In an instant, the picture changed again: a pool of black water that is about to dry up, next to several rolling bare mountains; More than a dozen chemical plants beside the mountain "grunted" and emitted black smoke. Then, the phenomenon of flying sand and stones suddenly appeared on the screen. There were deserts everywhere, and there were no cacti. There were only four or five monsters who called themselves "beautiful women" just now, and there were several strange buildings around them. This scene is a bit like the Sahara desert. Suddenly, the screen disappeared and I went back to the tunnel. The monster in front of me said to me, "little friend, you understand everything now!" "It is because our ancestors destroyed the environment at will that it became like this. You must go back and tell people to take care of the environment! ……"

Then I went back to my room. Looking at the moonlight outside the window, I secretly made up my mind: Yes! Do it!