2011年12月大学英语四级模拟试题_第4页

　　16. A) To help solve their psychological problems.
　　B) To play games with them.
　　C) To send sham to the hospital.
　　D) To make them aware of its harmfulness.
　　17. A) They need care and affection.
　　B) They are fond of round-the-world trips.
　　C) They are mostly from broken families.
　　D) They are likely to commit crimes.
　　Passage Three
　　Questions 18 to 20 are based on the passage you have just heard.
　　18. A) Because it was too heavy.
　　B) Because it did not bend easily.
　　C) Because it did not shoot far.
　　D) Because its string was short.
　　19. A) It went out of use 300 years ago
　　B) h was invented alter the short how.
　　C) It was discovered before fire and the wheel.
　　D) It's still in use today.
　　20. A) They are accurate and easy to pull.
　　B) Their shooting range is 40 yards.
　　C) They are usually used indoors.
　　D) They took 100 years to develop.