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

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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

单项选择题

The finds of Geoffrey Marcy are frightening in that______.

A．it's the first time that astronomers have discovered such space entity
B．it substantially implies some kind of subversion to our present realization
C．it is an entire negation of the present astronomic research
D．they discovered the first extra-solar planet in astronomic study