Before we send humans into deep space, we'll have to find out just how long the human body can survive in a weightless environment. One problem is that in space there's no physical sensation to let you know when you're upside down and astronauts have to rely on possible clues from their surroundings. A few hours after reaching orbit , one in three of all astronauts will experience space sickness--a feeling rather like carsickness. There is also the problem of protection from the extreme hazards of space such as constant meteorite bombardment and radiation. It is going to take some clever technology to keep rockets and astronauts from these dangers. Even with a well-protected spaceship, space travel isn't going to be easy. No matter what you travel in, it is going to be a long flight in space! Science fiction writers often imagine using suspended animation , a kind of forced long-term sleep, as a way for astronauts to escape the boredom of long missions. An even stronger measure might be to freeze the astronauts. We already use cryogenic techniques to preserve dead bodies and store human embryos . Freezing living adults may not be so far away, but perhaps we don't have to do that. Perhaps we should use our existing technology and send frozen embryos to the far corners of universe. Hundreds of years from now, billions and billions of miles away, the embryos will be thawed and their hearts will start beating. These astronauts of the future will not grow inside a mother's body but will be produced in a machine. They will be brought up by robot. It may seem strange but one day it might just happen. The passage is mainly about _ . A) the bright future of space flight B) the possibility to train embryo astronauts C) the physical and mental conditions of astronauts D) the problems and the possible solutions to them in long space flights
D
Energy pod: It was designed by a US company with NASA technology. It puts the human body in the best sleeping position and blocks outside noise to create an ideal napping experience. Silicon Valley high-tech companies such as Google provide the Pod for employees. White noise radio: White noise is a sound signal that contains equal power and frequency. Some radios provide white noise to mask other noises so that people can sleep without disturbance. High-tech sleepwear: A US-based company designs a nightgown with special fabric that stimulates blood flow to tired muscles helping one relax in deeper restorative sleep. Emu pillow: Inspired by emu that buried its head in sands when it's scared, a type of pillow has been designed in China for office workers to take a nap, safe and sound. It turns the computer desk into a sleep hub with even two pockets to store the hands. Which of the following is produced with the help of a kind of bird? A) White noise radio. B) Emu pillow. C) High-tech sleepwear. D) Energy Pod.
B
Q: Can dolphins talk? Maybe they can't talk with words, but they talk with sounds. They show their feelings with sounds. Dolphins travel in a group. We call a group of fish a "school". They don't study, but they travel together. Dolphins talk to the other dolphins in the school. They give information. They tell when they are happy or sad or afraid. They say "welcome"when a dolphin comes back to the school. They talk when they play. They make a few sounds above water. They make many more sounds under water. People cannot hear these sounds because they are very, very high. Scientists make tapes of the sounds and study them. Sometimes people catch a dolphin for a large aquarium . People can watch the dolphins in a show. Dolphins don't like to be away from their school in an aquarium. They are sad and lonely . Dolphins There are many stories about dolphins. They help people. Sometimes they save somebody's life. Dolphin meat is good, but people don't like to kill them. They say that dolphins bring good luck. Many people believe this. People can't hear the dolphin's sounds because _ . A) they are above the water B) they are under the water C) they are very high D) they are very low
A: C
Q: Charlie Chaplin was one of the greatest and most widely loved silent movie stars. From Easy Street (1917) to Modern Times (1936), he made many of the funniest and most popular films of his time. He is best known for his character "the little tramp ". It is this kind-hearted character that we connect with the time of silent movies. Born in London in 1889, Chaplin first visited America with a theater company in 1907. Appearing as Billy in the play Sherlock Holmes, the young Chaplin toured the country twice. On his second tour, he met Mack Sennett and was signed to Keystone Studios to act in films. In 1914, Chaplin made his first short film, Making a Living. That same year, he made thirty-four more short films. These early silent shorts allowed very little time for anything but physical comedy, and Chaplin was extremely good at it. Chaplin was known as one of the most demanding men in Hollywood. No matter how big or tiny the size of the part, Chaplin walked each actor through every scene. Chaplin knew that a successful scene wasn't simply about the star, but about everyone on the screen. He required that all the actors and actresses work together in every performance. The only way to achieve it was to keep complete control over every scene. As he became more popular, he used more and more creative and difficult filming techniques. Movies such as his 1925 hit, The Gold Rush, required endless reworking of scenes and rebuilding of sets. Though Chaplin is of the silent movie era, his achievements were carried over into the films of today. His strictness and concern for the processes of acting and directing made his films great and led the way to a new and more wonderful cinema. Chaplin's working life in entertainment lasted over 75 years, from the Victorian stage and the music hall in the United Kingdom as a child performer, until close to his death at the age of 88. We can learn from the passage that _ . A) Charlie Chaplin went to America for the first time at 20 B) Charlie Chaplin made 35 short films in total in 1914 C) short films had many kinds of comedy besides physical comedy D) Charlie Chaplin didn't make any popular movies after 1936
A: B