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单项选择题

A．Last week.
B．The day before yesterday.
C．Yesterday.
D．This morning.
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单项选择题A．A receipt and the cheque stub.B．The guarantee and the receipt.C．The radio and the box.D．The credit card and a receipt.

A．A receipt and the cheque stub.
B．The guarantee and the receipt.
C．The radio and the box.
D．The credit card and a receipt.

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.

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.

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.