单项选择题

The passage informs us that ___________________.

A．Americans do not understand their own heritage and culture well
B．the author does not mind Americans' cultural blindness
C．Americans pay little attention to foreign customs and languages
D．America has no problems in the world because it's the most powerful country

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热门试题

单项选择题

Snowball Earth might have occurred as a result of ______________.

A．ice reflecting sunlight and heat
B．the growth of polar ice sheets
C．the increase of rainfall
D．the huge loss of carbon dioxide

单项选择题

Which of the following statements is NOT true according to the passage

A．Today's continents might have originated from the same supercontinent.
B．The increased rainfall was responsible for the weathering of rock.
C．Rodinia split owing to the eruption of volcanic rock.
D．Rock weathering involves the loss of carbon dioxide.