Which one of the following has a different stress from the others?  
#17239
A
capital
B
medicine
C
result
D
empty
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_________ is celebrated on September 10’.
#17274
A
National Day
B
Teacher’s Day
C
Dragon Boat Festival
D
Spring Festival
_______ provides many hours of air for astronauts in space.
#17237
A
An air tank
B
A power pack
C
A helmet
D
A space sleeping bag