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【单选题】
If a financial institution has 50% of its portfolio in a bond with a five-year duration and 50% of its portfolio in a bond with a seven-year duration, what is the duration of the portfolio?A.
12 years
B.
7 years
C.
6 years
D.
5 years
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【简答题】金属的锻造性能的影响因素有哪些?影响规律如何?
【单选题】You won't have the chance to succeed when you ______. [ ]
A.
gave up
B.
give up
C.
will give up
D.
are giving up