原核生物基因没有内含子。 ( )
参考答案：错
–Are they ______books?
--No, they aren't. They're ______ books.
A．you; they
B．your; he
C．your; her
D．your; she
常用的抓包软件有（）。
A、ethereal
B、MS office
C、fluxay
D、netscan
