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【简答题】
光在同一种______中是沿直线传播的．光在真空中的速度是______km/s．
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【简答题】随参信道传输媒质的三个特点是 、 和 。信号在随参信道中传输时,产生衰落的主要原因是由于 。
【简答题】P21 Exercise 3 What kinds of films do they like? P21 Exercise 3.wmv
【单选题】What kinds of films do you like best?
A.
I prefer going skating
B.
I like cartoons. What about you?
C.
They are very funny.
【单选题】-What kinds of films do you like best? -__________.
A.
I like talk show best.
B.
I like action films.
C.
I like reading best.
【单选题】A: What kinds of films do you like best? B:
A.
I prefer going skating
B.
I like cartoons. What about you?
C.
They are very funny.