Question: Read the following article and answer the question. Article: Do you know why you sleep? You may think it's because you're tired. Or perhaps you've been told sleep is good for you. Yet no one knows exactly why or how people sleep. Until the early 1950s, most scientists thought the body and brain rested during sleep. Then a scientist watched people sleep. He noticed that during periods of between 5 and 30 minutes each, sleepers' eyes made rapid movements, as if they were watching something. He called these periods REM sleep, for Rapid Eye Movement. Periods when sleepers' eyes did not move he called non-REM sleep. Whenever the scientist woke people during REM sleep, they were having vivid dreams. Measurements showed that sleepers' pulses went up quickly during REM sleep. Their breathing, heartbeat, and the blood going to the brain also increased. Far from being a time of rest, REM sleep is a time when the body is hard at work. Scientists still don't know the reason for this. Some believe REM sleep makes learning easier. Babies spend a lot of time in REM sleep. Because of this, some scientists believe that REM sleep helps the brain grow. Others think REM sleep is a time for the brain to empty the day's garbage. One thing all the scientists agree on is that sleep is necessary. Without enough sleep, people make mistakes. Most major car accidents happen during the early morning hours, when people are sleepiest. Question: What is the main idea of the article? Answer:
OPTIONS:
- REM sleep helps the brain grow.
- REM sleep has been watched and recorded by scientists.
- REM sleep is a time to empty the day's garbage.
- REM sleep is an active time when the body is hard at work.
Answer: REM sleep has been watched and recorded by scientists.

Question: Read the following article and answer the question. Article: Little Peter is a boy of nine. He began to go to school when he was six, and now he is in Grade Three. He lives not far from the school, but he is often late for class. He likes watching TV in the evening and goes to bed late, so he can't get up on time in the morning. This term, Mrs. Black, Peter's aunt, teaches music in Peter's school. She is strict with Peter and often tells the boy to obey the school rules and come to school on time. Yesterday morning, Peter got up late. When he hurried to school, it was a quarter past eight. His aunt was waiting for him at the school gate. "You are ten minutes late for the first class, Peter," Mrs. Black said angrily. "Why are you often late for class?" "Every time, when I get to the street corner , I always see a guidepost . It says SCHOOL--GO SLOWLY!" Question: The guidepost is for _ . Answer:
OPTIONS:
- teachers
- Peter
- students
- Drivers
Answer: Drivers

Question: Read the following article and answer the question. Article: Lu Han was born in Beijing in April 20, 1990, who is a singer and dancer. Because of his outstanding appearance, he was discovered by SM Entertainment Company while shopping in Myeong Dong in South Korea. In 2010 he entered the SM Company to become its practice. On December 27, 2011 he first appeared through the EXO website. On April 8, 2012 he appeared to the public officially in the group of EXO. The EXO is one of the most pop music groups in Asia. His handsome looking, stage strength in singing and dancing, excellent personal charm won many fans'love. He was the only one of the EXO who was good both at singing and dancing. In his spare time, he likes playing magic cube and also does well in football and basketball. On 10th October, 2014, he _ the agreement with SM and then went back to China. Now the 24-year-old young man had his first try at acting. He started in the Chinese movie Returning to the 20s. In the movie, a 70-year-old woman becomes back to 20 again and plays in a band with her grandson. Lu Han played the role of the grandson. Another good news for the fans is that he is said to be invited to the Spring Festival Gala for 2015. Question: Where did Lu Han use to work as a singer? Answer:
OPTIONS:
- In America.
- In UK.
- In Japan.
- In Korea.
Answer:
In Korea.