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单项选择题

A．Because the interest rate rised successively in 2004.
B．Because the cost of oil kept increasing in 2004.
C．Because consumer confidence eroded in 2004.
D．Because trading condition deteriorated in 2004.
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单项选择题A．The talks haven’t started yet.B．The talks haven’t achieved much.C．The talks have produced a general agreement.D．The talks broke down and could not go on further.

A．The talks haven’t started yet.
B．The talks haven’t achieved much.
C．The talks have produced a general agreement.
D．The talks broke down and could not go on further.

单项选择题A．Small RNA molecules.B．The protein-coding regions.C．DNA and proteins.D．A shuttling messenger.

A．Small RNA molecules.
B．The protein-coding regions.
C．DNA and proteins.
D．A shuttling messenger.