[单项选择]Social scientists distinguish between what are known as treatment effects and selection effects. The Marine Corps, for instance, is largely a treatment-effect institution. It is confident that the experience of undergoing Marine Corps basic training will turn you into a formidable soldier. A modeling agency, by contrast, is a selection-effect institution. You do not become beautiful by signing up with an agency.
At the heart of the American obsession with the Ivy League is the belief that schools like Harvard provide the social and intellectual equivalent of Marine Corps basic training—that being taught by all those brilliant professors and meeting all those other motivated students and getting a degree with that powerful name on it will confer advantages that no local state university can provide, and even an Ivy Leaguer will make far more money in the future.
It is quite possible that the student who goes to Harvard is more ambitious and energetic and personable than th
A. have brilliant professors
B. have excellent peers
C. get better education
D. get lower salary after graduation

[单项选择]Social scientists distinguish between what are known as treatment effects and selection effects. The Marine Corps, for instance, is largely a treatment-effect institution. It is confident that the experience of undergoing Marine Corps basic training will turn you into a formidable soldier. A modeling agency, by contrast, is a selection-effect institution. You do not become beautiful by signing up with an agency.
At the heart of the American obsession with the Ivy League is the belief that schools like Harvard provide the social and intellectual equivalent of Marine Corps basic training—that being taught by all those brilliant professors and meeting all those other motivated students and getting a degree with that powerful name on it will confer advantages that no local state university can provide, and even an Ivy Leaguer will make far more money in the future.
It is quite possible that the student who goes to Harvard is more ambitious and energetic and personable than th
A. everyone will become much braver after being trained in the Marine Corps
B. everyone will become more beautiful after being trained in a modeling agency
C. everyone will become more active after being trained in a modeling agency
D. everyone will become smarter after being trained in the Marine Corps

[填空题]What’s the relationship between social network and technology network nowadays

[单项选择]Parents often faced the（）between doing what they felt was good for the development of the child and what they could stand by way of undisciplined noise and destructiveness.
A. paradox
B. junction
C. dilemma
D. premise

[单项选择]Parents often faced the ______ between doing what they felt was good for the development of the child and what they could stand by way of undisciplined noise and destructiveness.
A. paradox
B. junction
C. dilemma
D. premise

[单项选择]A great difference between American social customs and those of other countries is the way in which names are used. Americans have little concern for "rank", especially socially. Most Americans do not want to be treated in any especially respectful way because of their age or social rank; it makes them feel uncomfortable. Many Americans even find the terms "Mr.", "Mrs." or "Miss" too formal. People of all ages may prefer to be called by their first names. "Don’t call me Mrs. Smith. Just call me Sally." Using only first names usually indicates friendliness and acceptance. However, if you do not feel comfortable using only first names, it is quite acceptable to be more formal. Just smile and say that after a while you will use first names but you are accustomed to being more formal when you first meet someone.
Very often, introductions are made using both first and last names: "Mary Smith, this is John Jones." In this situation you are free to decide whether to call the lady "Mary"