更多"If the radio waves had reached our "的相关试题:
[单项选择]The practical use of radio waves brought about______.
A. new machines for planes
B. a radio directing and ranging device
C. new radio sets for RAF bombers
D. a discovering device
[单项选择]The British used radio waves because they______.
A. were more exact than sound waves
B. could not be detected
C. could penetrate fog and clouds
D. were easier to use than sound waves
[单项选择]Columbus had accomplished one of the most amazing and courageous（）in history.
A. performance
B. feats
C. events
D. acts
[单项选择]Friend A: Just call me dad! My wife and I had our first baby. Friend B:（）.
A. What a nonsense!
B. Really Congratulations!
C. Dad, are you OK
D. Sorry to hear it
[单项选择]We had our telephone ________ because we didn't pay the bill.
A. cut across
B. cut down
C. cut off
D. cut out
