【单选题】光纤是一种能够传输光频电磁波的介质波导,其结构上由( )组成
【单选题】We are all proud of the great changes in Beijing. We're sure Beijing will be even ________ tomorrow. [ ]
【单选题】光纤是一种能够传输光频电磁波的介质波导,其结构上由( )组成
【单选题】We‘re not sure if it ________ tomorrow. If it ________, we won't climb the South Hill. [ ]
【单选题】We’re sure to win the entrance examination ___________ next year.
【单选题】—Mr. Smith always has _______ to tell us. [ ]
A.
some good pieces of news
B.
some pieces of good news
C.
some good piece of news
D.
some piece of good news
【单选题】We're proud of the great changes in Xining, and we' re sure it will be even _______ tomorrow. [ ]