In view of the fact that his enemies knew him as cheerful, his allies exhorted him, as a matter of self-preservation, to（）himself as taciturn.

单项选择题His father served as（）to the entire Garcia clan, dispensing money and advice to those who needed it, and the family, in turn, revered him.

A．prelate
B．paterfamilias
C．mountebank
D．valet
E．creditor

单项选择题With the continuing accomplishments of the human genome project, ambitious strategies to identify DNA sequences that are important in mammalian gene regulation are becoming increasingly（）.

A．stellar
B．feasible
C．prominent
D．intrusive
E．utile