单项选择题

Oneworld in the passage refers to （）.

A．a travel agency
B．a union of airlines
C．a series of tourist attractions
D．the title of a flight program

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（）he was seriously ill, I wouldn't have told him the troth.

A．If I knew
B．If I know
C．Had I known
D．Did I know
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What is essential for people to stand pain according to the writer（）

A．Their relaxation.
B．Their interest.
C．Their nerves.
D．Their attitude.
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