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Movies are a great means of entertainment for many. There are some advantages of watching movies. Comedies, for example, help reduce your blood pressure. Laughter for 15 minutes during a film makes your blood vessels (血管 ) wider.  Besides, when you watch a sad movie. you're more likely to come away from it thinking about loved ones and feeling happy about what you have.
Watching movies can make you creative. A study shows that young children who watched the use of magic in Harry Potter, score significantly higher in a creative thinking test than children who watched something else. Moreover, movies are very useful for strengthening people' mental health. They enable people to take time to really relax and temporarily forget about their daily concems and problems.
However, watching movies aren't always beneficial. Studies have shown that some people get real pleasure out of being scared by horror movies, but in various ways they may be risking their physical and mental health without even knowing it. When you watch a tense scene in a movie, your heart rate and blood pressure increase. Meanwhile this change in your brain chemistry reminds you of times when you were in a similar state, even if you have no idea you even had those memories.So if something horrible happens to you. being scared again by a movie can unintentionally make you experience it once more.
Scientists, politicians and parents have debated for decades if being exposed to movie violence leads to actual real-life violence. Overall the answer to that is probably still up in the air, but a new study seems to prove that watching aggression on screen can contribute to being a bully (土霸 ) in real life, even if it is just in the short term.
In conclusion. certain movies play a positive role, but not all movies do. It depends completely
on the subject of the movie. So it's always advisable to choose the movies concerning something
positive.
18. How does watching sad movies benefit us according to the text?
A. It makes us content with our lives.
B. It rides us of unhappy memories.
C. It reduces our risk of illness.
D. It develops our creativity.
19. What does the underlined part "in the air" in Paragraph 4 mean?
A. Meaningless.
B. Attractive.
C. Uncertain.
D. Obvious.
20. What does the author advise us to do to reduce the passive effect of movies?
A. Enjoy movies with more companions.
B. Make a wise choice of what to watch.
C. Try our best to watch movies less often.
D. Raise our ability to tell right from wrong.
18．【答案】A。解析：细节题。根据题干关键词sad movies定位至第一段。由“Besides．when you watcha sad movie. you're more likely to come away from it thinking about loved ones and feeling happy about what youhave”可知，人们在看完悲伤的电影后会想起自己爱的人，为自己所拥有的东西感到庆幸。故本题选A。
19．【答案】C。解析：含义题。画线部分所在句意为“总体而言，该问题的答案可能依然    。但是新的研究证明，荧幕中的暴力情节似乎会导致现实中的……”。由此可知in the air应该指“答案不确定”。meaningless“毫无意义的”，attractive“有吸引为的”，uncertain“不确定的”，obvious“明显的，显然的”。故本题选C。
20．【答案】B。解析：细节题。根据第五段中的“So it's always advisable to choose the movies concemingsomething positive”可知，作者建议我们选择内容积极的电影，B项“明智地选择看什么电影”符合文意。故本题选B。

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