单项选择题

A．Look after something for him.
B．Get some travel information.
C．Tell him the way to the left-luggage office.
D．Help him to carry some luggage.
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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.
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.
问答题
S4
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