What criterion did Adam Smith seem to go by in his classification of social groups?·？
If you compare the first and second paragraph, what groups of people did Adam Smith leave out in his classification?，·？
Who were the “new rich” during the nineteenth and early twentieth centuries?1920，“”？
According to the passage, what did those people do who intended to make their children move up in the social ladder?，？
In the twentieth century class differences have been partly smoothed out by ______.，______
Which of the following best describes the passage as a whole?？
Millions of years ago, men and apes had continued to __________.，__
How many stages are there before men were evolved?？
What’s the meaning of “amphibian” in line 3 of paragraph 4?43“”？
What is the main idea of the last paragraph?？
Having good international contacts gives the company a competitive advantage over its __________.
This system __________ additional financial burdens __________ many people.
What __________ employees to do their jobs well? Competition with coworkers, for some.？，。
The __________ of outer space is one of the greatest triumphs of modern science.
It can be an enormously __________ and exciting experience. The kids are looking forward to it.。。
