Whenpushingahead，wiresleadingfromthequartersoftheafteroutboardbargestothebowofatowboat（）.
A. preventthetowboatfromslidingwhentherudderismoved
B. preventthebargesfromspreadingoutwhenbackingdown
C. holdthetowboatsecurelytothebarges
D. preventthesidewisemovementofthefacebarges
（）通常由标题、导语、主体、背景材料和结尾几部分组成。
A. 工作总结
B. 消息
C. 广告
D. 小说
Theaircompressorpumpsairtothe（）.
A. expansiontank
B. combustionchamber
C. airreceiver
D. evaporator
Astheweatherwasworseningandwindforcerisingto8，myvessel（）wereyawingwithinfortydegreesofthecompass.
A. alongsidethewharf
B. groundedinthechannel
C. atbuoys
D. atanchor
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