单项选择题

Which of the following questions is best answered by information gained from Kohoutek

A．Where were comets formed
B．When were comets formed
C．Where was the solar system formed
D．How was the solar system formed
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单项选择题
According to the passage, what is one major component of Jupiter
A．Hydrogen cyanide.
B．Methyl cyanide.
C．Hydrogen.
D．Ammonia.
单项选择题
In what respect was Kohoutek a disappointment
A．It could be seen only through special equipment.
B．It did not approach the Earth.
C．It did not provide valuable scientific information.
D．It was moving too rapidly for scientists to photograph.
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