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.

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热门试题

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

单项选择题Which of the following can be the best title for this passage

A．Education and Success
B．Extracurricular Activities at School
C．Athletic Sports
D．Intellectual Achievement

单项选择题Why did Ruby start painting according to Dick George（）

A．Because she was seven years old.
B．Because she was the first to come to the zoo.
C．Because she learned a lot from the goat and the chickens.
D．Because she had no elephant partners to play with.

单项选择题Why did people in the 19th century believe the existence of intelligent life on Mars

A．Because the surface of Mars seemed to be geometric.
B．Because the lines were drawn across the surface of the planet.
C．Because a system of canals was thought to be there.
D．Because it was the Martians that built the canals.