单项选择题

A．To find the way back to the nest.
B．To locate plant fibers.
C．To identify relatives.
D．To identify kinds of honey.
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单项选择题
First TV set was made__________.
A．in 1939
B．in 1950s
C．in 1940s
D．in 1919
单项选择题
According to the passage, people’’s learning activities are possible because they______.
A．believe that emotions are fundamental for them to stay alive
B．benefit from providing help and support to one another
C．enjoy being rewarded for doing the right thing
D．know what is vital to the progress of society
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