A. correct

　　B. unbelievable

　　C. false

　　D. questionable

　　2. What does the author mean by saying “we can’t turn the clock back” in the third paragraph?

　　A. It’s impossible to slow down the pace of change.

　　B. The social reality children are facing cannot be changed.

　　C. Lessons learned from the past should not be forgotten.

　　D. It’s impossible to forget the past.

　　3. The most important thing parents should do to help their children is ________.

　　A. to provide them with a safer environment

　　B. to lower their expectations for them

　　C. to get them more involved socially

　　D. to set a good model for them to follow

　　4. Which of the following is the main idea of the passage?

　　A. Why America’s kids feel stressed today.

　　B. Problems of American society.

　　C. Remove children’s anxiety with more parents’ care.

　　D. Children suffer more anxiety than adults.

　　B

　　To make an estimate means to guess the number of things in a group or guess a measurement of some kind, it sometimes means to make a calculation about the future which is based not on exact data but on past experience. This kind of estimate has some basis, but it generally has to be changed and corrected later.

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