单项选择题

What is NOT the finding of searchers in these years

A．A solar system with a usual planet and an unusually huge one.
B．Gassy extra-solar planet careering about its star in short distance.
C．Huge planet orbiting in peculiar track with great gravity.
D．Solar system and Planet Earth are peculiar cosmic balls.

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单项选择题

The searchers used NOT to believe______.

A．other stars may have the planets resembling those going around the sun
B．planet forms owing to the gas and dust in star formation
C．the formation of star is subsequent to that of planet
D．star is formed by the collapsing interstellar cloud

单项选择题

The author cites the example of Geoffrey Marcy's finds to illustrate______.

A．astronomers have great breakthrough in the discovery of planets
B．the discovery of planets has to be extraordinary to arouse attentions
C．it's beneficial to encourage frequent communication in scientific study
D．astronomers know far from enough about planets around distant stars