单项选择题

With an eighty-hour week and little enjoyment, life must have been very ______ for the nineteenth-century factory workers.

[A] hostile
[B] anxious
[C] tedious
[D] obscure
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He underwent four ______ operations in two weeks.
[A] excessive
[B] extensive
[C] intensive
[D] successive
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The ship's generator broke down, and the pumps had to be operated ______ instead of mechanically.
[A] manually
[B] artificially
[C] automatically
[D] synthetically
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