发语性内在语，指提示，引出下文，如呼台与之前，在节目，稿件，层次，段落，语句之间加上适当的词语。
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Why should you wear a self-contained breathing apparatus before entering the engine room after the fixed CO2 system has been discharged to combat a major fire?（）
A. Because carbon dioxide dilutes the oxygen concentration in the atmosphere and may cause asphyxiation
Because carbon dioxide breaks down in a fire into carbon monoxide which may cause blood poisoning in the person breathing this gas
C. Because carbon dioxide is a colorless and odorless gas that becomes highly toxic in the presence of high temperatures and will quickly incapacitate a person exposed to this gas
D. This action is unnecessary as carbon dioxide is not poisonous nor toxic but is a relatively harmless ga
红星公司11月发生了下列业务：（1）因违反合同约定时间发货而支付违约金1000元；（2）因北方洪灾而给当地居民捐救灾款30000元；（3）有大客户来参观考察，陪客户外出活动发生支出2200元；（4）参加一家公司开业庆典活动，支付赞助费5000元；（5）支付出租设备的维修费用600元。上述业务会导致营业外支出增加（）元。
A. 31000
B. 33200
C. 36000
D. 36600
利率风险包括交易账户中的（）的风险。
A. 期权性风险
B. 利率风险
C. 债券衍生工具头寸风险
D. 债券风险
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