单项选择题

The author believes that more houses were bought last year because______.

A．the economic recession was less serious
B．many people earned more before
C．the interest rate was very low
D．real-estate developers lowered their prices

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热门试题

单项选择题

The underlined word upbeat in paragraph 2 probably means ______.

A．hopeful
B．defeated
C．conscientious
D．uncertain

单项选择题

According to the passage, mathematicians present a danger to scientists because ______.

A．mathematicians may provide theories that are incompatible with those already developed by scientists
B．mathematicians may define situation in a way that is incomprehensible to scientists
C．mathematicians may convince scientists that theoretical assumptions are facts
D．scientists may come to believe that axiomatic statements are untrue