HCV的核酸类型是
A．单股正链RNAB．单股负链RNAC．双股RNAD．单股DNAE．双股DNA
参考答案：A
列举两宋时期对外贸易的重要港口。
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--- This dress is a little . Can you show me another one?
--- What about the orange one?
A．cheap
B．high
C．low
D．Expensive
