单项选择题

Why was Kohoutek referred to as" the comet of the century"

A．It was thought to be extremely old.
B．It passes the Earth once a century.
C．Scientists predicted it would be very bright.
D．Scientists have been tracking it for a century.

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单项选择题

The major point discussed in the passage is

A．the importance of developing writing skills.
B．the complexities of spelling.
C．the correct way of marking compositions.
D．the relationship between spelling and the content of a composition.

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.