46. The general topic of the passage is .
A. American culture B. American society
C. Americans’ activities D. Americans’ personality
47. Which of the following statements is NOT TRUE according to the passage？
A. Americans do not like to depend on other people.
B. Friendships among Americans tend to be casual.
C. Americans know a lot about international affairs.
D. Americans always seem to be on the go.
48. The phrase“highly charged”（Paragraph 2）most probably means .
A. extremely free B. highly responsible
C. very cheerful D. full of mobility and change
49. It can be inferred from the passage that .
A. Americans want to participate in all kinds of activities
B. Americans’ character is affected by their social and geographical environments
C. Americans do not know how to deal with silence
D. Curiosity is characteristic of Americans
50. According to the passage，Americans tend to ignore the rest of the world because .
A. they are not interested in other countries
B. they are too proud of themselves
C. their country does not have many neighboring nations
D. they are too busy to learn about other countries
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