单项选择题

They remained full of hope and determination ______ their repeated failures.

A．in spite of
B．instead of
C．in search of
D．because of
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单项选择题
Which of the following is the best title for the passage
A．Television in the Electronic Era
B．Harmful Effects of Television Viewing
C．First Steps in the Invention of Television
D．The Art of Television
单项选择题
An important discovery in early television was the electrical resistance of___
A． mosaics
B．the human eye
C．lenses
D．the element selenium
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