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【单选题】
下列协议中使用传输层UDP的应用层协议是（ ）A.
SMTP
B.
HTTP
C.
FTP
D.
TFTP
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反馈参考答案：
举一反三
【单选题】When we practice_____English,we often end up___in Chinese.
A.
speaking,speaking
B.
speaking, to speak
C.
to speak,speaking
D.
To speak, to speak
【单选题】We all do more speaking more speaking ______, even when we have a break after class.
A.
now and then
B.
by and by
C.
step by step
D.
more or less
【单选题】You shouldn’t keep silent when ____
A.
speaking
B.
spoken to
C.
spoken
D.
speaking to
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