单项选择题

Among the following four cities, the difference between the afternoon high and the evening low is smallest in （）

A．Kansas City
B．Miami
C．Atlanta
D．Seattle

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单项选择题The difference between the afternoon high and the evening low is greatest in （）

A．Seattle
B．Los Angeles
C．Las Vegas
D．Phoenix

单项选择题According to the forecast, （）

A．Kansas City will be warmer than Toronto
B．temperatures will be the lowest in Seattle and Minneapolis
C．the weather will be fine in most of the listed cities
D．more than half of the listed cities ore cloudy or rain likely

单项选择题How is the 1996 discovery related to the possible existence of organisms on Mars

A．The meteorite containing organic compounds is part of Mars.
B．A Martian rock struck Earth about 11,000 years ago.
C．The organisms came back to life after the collision with Earth.
D．The inhabiting organisms appeared more than three billion years ago.

单项选择题What were the Mars' seasonal changes in color believed to be

A．The natural changes on the planet.
B．The seasonal cycles.
C．The movement of some life form.
D．The storm of dust in its atmosphere.

单项选择题A variety of extracurricular activities are added in American schools （）

A．to help students climb the education ladder
B．to enrich students' dull life at school
C．to help students become more successful in later life
D．to extend college education down into elementary schools