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简述债券信用评级机构评定债券等级时主要考虑的因素。

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听力原文：M: OK, Mrs Wentworth, how is our share portfolio today？
W: Generally healthy. Nitro Chemicals have gone up 14p to 200 pence. Forsythe Bank have gone down 2p to 301 pence, but we only have 500 of those shares.
M: OK.
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W: Yes, and we've got 2,000 shares each in Rose Computers and Pharmedico Drugs and they have both risen slightly. Rose has gone up 5p to 154, and Pharmedico is now selling at 423 pence a share.
&8226;Look at the table below.
&8226;Some information is missing.
&8226;You will hear a woman talking about share prices.
&8226;For each question (9-15), fill in the missing information in the numbered space using a word, numbers or letters.
&8226;After you have listened once, replay the recording.
(9)