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【单选题】
FTP协议在使用时需要建立两个连接，即控制连接和数据传输连接，并用不同的端口号标识两个连接。其中用于数据传输连接的端口号是（ ）。A.
25
B.
23
C.
21
D.
20
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举一反三
【单选题】When anthropologists refer to culture, they refer to the social legacy that one___from his or her group.
A.
acquires
B.
inquires
C.
requires
D.
conquers
【简答题】We use "a mouthful of beer " to refer to the beer we put in our mouth at one time. Likewise, we can use"______"to refer to the ice cream we can use a spoon to scoop at one time.
【单选题】The phrase black market used to refer to a market for illegal dealings, and now it can be further metaphorized to refer to any secret, illegal dealings. This meaning is transferred from one to another...
A.
nature
B.
domain
C.
period
D.
race
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