单项选择题

A．Because they were once overlooked by the team at Whitehead Institute.
B．Because they are composed by tiny, single-stranded pieces of RNA.
C．Because they were not found by the researchers until 2000.
D．Because they may exert great influence to human life’s functions.
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单项选择题
A．To make the condition of finance boost.B．To improve the level of rural healthcare.C．To hold a national health conference.D．To increase the examination of SARS.
A．To make the condition of finance boost.
B．To improve the level of rural healthcare.
C．To hold a national health conference.
D．To increase the examination of SARS.
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.
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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