When you watch 3D movies or TV, you have to wear a special pair of glasses. The 3D glasses make the images from the screen look like they are there in the room with you.

    Three-dimensional, or 3D, means having three dimensions（维度）: width, height and depth. 3D technology（技术） is based on the way the human brain（大脑） and eyes work. Because the pupils of a person's eyes are about 6.5era apart（分开）, when we look at something, each eye sees,it from a different angle（角度）. Our eyes send the two images to our brain, and the brain puts them together. The small difference between the image from the right eye and the image from the left eye allows us to see depth.

    When we view pictures and television in two dimensions, each eye gets the same information. That is because the image has no real depth, and there is only one of viewing it. So the goal of 3D technology is to get a different image into each of the viewer. It uses two film projectors. One projects a left eye image and the other projects a right image. The 3D glasses allow us to see a different image in each eye.

    While watching 3D films, we feel that we are in the same environment as the things we're watching. However, it also has its disadvantages. The 3D glasseswork by controlling the amount of light that reaches the eyes. It makes the screen look darker. What's more, people with eye problems may get headaches if they spend too much time watching 3D movies，because their brains need to work harder to "read" the images.

    Tom went to see his grandparent with his father. In the train Tom often put his head out of the window. His father said, "Tom, don't put your head out of the window." But Tom went on putting his head out of the window.

    His father took Tom's hat quietly and hid it behind his back and said to Tom, "You see your hat is gone." Tom was afraid. His father said, "Well, whistle(吹口哨) once. Maybe your hat will come back." Tom whistled. His lather put his hat on Tom's head quickly. "Oh! It's wonderful!" Tom laughed and said. He quickly took his father's hat and threw it out of the window. "Now it's your turn to whistle, Dad!" he said happily.

    Bob Smith is old. He has two big houses and a new car. He has no wife， but he is a father of four children. He has two sons and two daughters. One son is from (来自于) Canada. His name is Jack. The other (另一个) is from England. His name is Mike. One of his daughters is from China. Her name is Meimei. She is eleven years old. The other is from America. Her name is Lucy. She's eleven, too.

    Bob Smith is not the children's real father, but he loves them very much. The children love their “father”, too. Bob Smith has many toys (玩具) for the children. He gives different (不同的) toys to different children. The boys play with toy cars. The girls play with doll (娃娃) and toy animals. Bob Smith is their good friend.

    Nelson Mandela, the first black President of South Africa, passed away at his home. He is one of the greatest people in the 20th century. The whole world mourned the father of new South Africa. His life is full of stories.

根据内容选择最佳答案。

    Gina comes from England. She is fourteen years old. Her mother is Mrs Johnson. She is a nurse at a hospital. She likes fruit and vegetables. She doesn't eat too much sweet food or meat, so she stays healthy. Gina likes chocolate and candy. But her mother tells her that too much sweet food isn't good for her teeth. Gina likes cola. But her mother tells her that it isn't a kind of healthy drink. Gina thinks her mother's words (话) are right. So she eats well and stays healthy. Gina's father is a bus driver. He likes having meat. He likes sweet food--chocolate and candy too. He eats too much food for dinner so he is fat. Gina and her mother often say to him, "Healthy food and drinks are important to everyone."