3′末端有多聚腺苷酸的RNA是（）.
A．mRNA
B．rRNA
C．tRNA
D．hn RNA
E．sn RNA
参考答案：A
The news that our school will move to a better place sounds .
A．well
B．suddenly
C．exciting
D．happily
My sister bought me a new camera. I don't know ______. Can you help me? [ ]
A. how to use it
B. how to use
C. what to use
D. what to use it
