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【单选题】
以下對於IEEE 802.11 RTS/CTS機制的敘述何者有誤？A.
RTS 與 CTS 訊框中必須標示本次資料訊框傳遞所要占用無線頻道的總時間長度
B.
在資料訊框傳送之前，傳送端工作站必須先發送 RTS 訊框給接收端工作站
C.
當一個工作站收到一個目的地位址是自己的 RTS 訊框時，便馬上回送一個 CTS 訊框給傳送端
D.
如果一個工作站只收到一個目的地不是自己的 CTS 訊框，但沒有收到對應的 RTS 訊框時，此工作站仍允許立即使用 DCF 機制來傳遞待送的資料。
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举一反三
【单选题】What did the cellphone data show about 'routine'?
A.
One's routine affects his work pattern.
B.
Our routine affects our human nature.
C.
One's work pattern determines his routine.
D.
Our human nature determines our routine.
【单选题】听力原文：W: You looked rather worried. M: Yes , I was thinking about the Jone's case actually. It's a tough one. Why does the man look worried?
A.
Because Jone has a rough case.
B.
Because Jone's case is difficult to deal with.
C.
Because Jones has lost the case.
D.
Because Jone's is very tough.
【单选题】Jone’s father was among the first to make his fortune in___________is now known as the most fantastic tourist attraction—Hawaii.
A.
where
B.
what
C.
which
D.
that
【单选题】Most of Fei Yuqing's songs are light , ____ Jay Chou's, but their cooperative song is very successful. [ ]
A.
within
B.
as
C.
like
D.
unlike
【单选题】听力原文：W: You looked rather worried. M: Yes, I was thinking about the Jone's case actually. It's a tough one. Why does the man look worried?
A.
Because Jone has a rough case.
B.
Because Jone's case is difficult to deal with.
C.
Because Jone has lost the case.
D.
Because Jone's is very tough.
【单选题】---When is Jay’s concert? --- It’s ______ three o’clock ______ the afternoon of July 18 th .
A.
at, in
B.
at, on
C.
on, in
D.
in, on
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