单项选择题

Absorbed in her work, she was totally ______ her surroundings.

A．liable for
B．separated by
C．oblivious of
D．concerned about
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单项选择题
The illegal workers are ______.
A．hard-working but costly.
B．lazy but cheap.
C．hard-working and ambitious
D．hard-working and cheap.
单项选择题
Based on the essay, which of the following sentences is the best conclusion about the characteristics of a successful inventor
A．The person must be fascinating and interesting to other people.
B．The person must be relaxed and able to work long hours.
C．The person must go to specialized schools to learn the necessary skills.
D．The person must be persistent and ambitious about inventing.
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