单项选择题

In the sentence "For convenience, biographies will be included in the present chapter, while catalogues will be treated in the next", the word "while" is used to express ______.

A. reason
B. time
C. contrast
D. concession
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单项选择题
Frank had spoken to him about not taking everything so seriously but to learn how to ride the ups and downs of marriage. The underlined phrase is closest in meaning to ______.
A. troubles
B. fetters
C. bonds
D. vicissitudes
单项选择题
A．loadingB．holdingC．seizingD．carrying
A．loading
B．holding
C．seizing
D．carrying
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