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2 năm trước
Read the passage carefully, then choose the best answer for each question.
THE MEANING OF DREAMS
Did you have any interesting dreams last night?
Our dreams come from a part of the brain that contains our thoughts and memories. A person can have up to six dreams a night, and each dream usually lasts from 10 to 40 minutes. Everyone dreams, but not everyone remembers their dreams. Most people dream in color, usually with sound. And we usually dream about ourselves and the people we know.
Why Do We Dream?
Alan Siegel is a scientist who studies dreams. "Dreams help us get in touch with our deeper feelings,” he says. "They can tell us a lot about ourselves, and can help us figure out problems.” Another scientist, Robert Stickgold, thinks dreams come from our memories. He believes we dream to remember, because memories are useful to the brain. Stickgold says the purpose of dreaming through these  memories is to help us learn from the past.
Here are a few types of dreams and what people think they mean.
Dream 1: You Meet Someone While in Your Pajamas
Sometimes people dream that they meet someone they know while wearing their underwear (or nothing at all!). This dream may be the result of an embarrassing  event in your life. Some people think we dream about embarrassing situations if our brains are trying to deal with  an event in our own lives.
Dream 2: You're Flying
If you dream about flying, you are probably quite happy. This is a good period in your life. You may feel that other people see you as a leader.
Dream 3: You Didn't Study for a Test
This probably means you are worried about an important event coming in your life. If you're not prepared for the event, your dream may be telling you, "It's time to get to work!"
Which of these sentences about dreams is NOT true?
A.They usually have color and sound.
B.Each dream usually lasts for 10 to 40 minutes.
C.Not everyone remembers their dreams.
D.Most people have about ten dreams a night.
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Coal, oil, and natural gas supply modern civilization with most of its power. However, not only are supplies of these fuels limited, but they are a major source of pollution. Therefore, it's important to improve, explore and develop such alternative energy sources as nuclear, water, solar and wind power. Each of these alternatives, however, has advantages and disadvantages.
Nuclear power plants efficiently produce large amounts of electricity without polluting the atmosphere; however, they are costly to build and maintain, and they create the difficult problem of what to do with nuclear waste. Hydroelectric power is inexpensive and environmentally safe, but impractical for communities located far from moving water. Wind power is a pollution-free source of renewable energy but it cannot be used in many parts of the world where there is insufficient wind. Solar power is renewable, it does not cause pollution and it does not add the earth's heat load. However, it is difficult to collect and store. Solar power also requires expensive equipment. 
Wind power___________.
A.cannot be used in places that has strong wind 
B.is never completely used up 
C.is a source of pollution
D.cannot replace itself

Read the passage carefully, then choose the best answer for each question.
HAVE ALIENS VISITED US?
Many people have stories about seeing aliens. Here are two.
Judy Varns works for a group called the Mutual UFO Network. The purpose of this group is to research UFO sightings. Varns thinks a place called Area 51, in Nevada in the U.S., may be the best place on Earth to see UFOs. One day, she took some photos in the area and saw something she thinks is a UFO. "We saw this little disk-shaped thing in our photos. It's kind of exciting," she says.
Pat Travis lives near Area 51. One night, she saw a strange light in the sky. The light's movements were very unusual. Travis saw the lights move sideways and up and down. She saw them make many strange moves. Travis thinks it was a UFO.
Secrets of Area 51
Some people think Area 51 is where the U.S. Air Force keeps secrets, like UFOs that came to Earth and the aliens inside them. But really, Area 51 is a place the U.S. Air Force uses to test new technology, such as new kinds of aircraft.
James McGaha is a pilot who flew airplanes at Area 51. "There is absolutely no UFO activity at Area 51," he says. "No flying saucers, no live aliens, no dead aliens."
So what did Varns and Travis see? Bill Fox worked at Area 51, too. He thinks he knows the answer. "We did build some strange-looking airplanes," he says. "I could see why some people would think they were UFOs."
So are UFOs real? You'll have to decide for yourself. But if you do visit Nevada, keep your eyes on the skies!
What does “I could see why some people would think they were UFOs” mean?
A.I agree with people who believe in UFOs.
B.I saw UFOs near Area 51 with my own eyes.
C.I understand why some people think they saw UFOs.
D.I claim that UFOs are real because many people have seen them.

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