　　What does the passage imply about a brown dwarf?.-考呗网

专八

单选题 　　What does the passage imply about a brown dwarf?.

A．It's bright.
B．It's not very big.
C．It's not a planet.
D．It's huge.

本题考查对句意的理解。第一段第二句就提到科学家发现了a dark star，故排除A；第二段说Nemesis围绕太阳转，可见它是行星，故排除C；第六段提到，Nemesis是一颗矮行星——a star that neveraccumulated enough nlass，所以它并不大，故排除D。

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1 　　The Nemesis influences the comets by__________

A．exerting effects on their birthplace
B．gravitational pull of planets
C．affecting the Oort Cloud
D．influencing their way to the Oort Cloud and the inner solar system

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2 　　Muller found that __________

A．the star orbits around the sun
B．the star is disturbed by the Oort Cloud
C．the star is influencing the Oort Cloud
D．the star is responsible for extinction of life on the Earth

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3 　　A suitable title for the passage could be__________

A．Brown Dwarf Orbits around the Earth
B．Sun "s Hidden Twin Stalks Earth
C．Oort Cloud and Comet Shower
D．Star, Planet and Dwarf

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