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from the time _______ between two radio signals.
A. interaction
B. alternative
C. interference
D. interval
20. Finding himself trapped in the Death Valley, he had a sudden feeling of _______.
A. despair
B. desperate
C. frightened
D. dreadful
21. In a time of social reform, people’s state of mind tends to keep pace with the rapid changes of
society.
A. take step
B. match up
C. keep in touch
D. make progress
22. If decisions are delayed until the problems become worse, possibilities for effective actions will be severely reduced.
A. options
B. notions
C. fortunes
D. occasions
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