[单选题] Because of the_______nature of our business, at times we may need emergency purchases.

1、[单选题]The buyers will pay the extra premium if the requests that insurance ________ more than 110%.

• A、covered
• B、be covered
• C、cover
• D、to be covered

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2、[单选题]We would like to take this ____ to establish business relations with you.

• A、opening 
• B、opportunity 
• C、step 
• D、advantage

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3、[单选题]As instructed, we will draw _______ you a sight draft for collection through the Bank of China.

• A、for 
• B、against 
• C、on    
• D、from

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4、[单选题]If you desire to _______ your goods against all risks, we can provide such coverage at a slightly higher premium.

• A、guarantee
• B、guard
• C、cover
• D、protect

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5、[主观题]敬启者：遵照你方10月27日来信的要求，我方特此寄送所需的形式发票一式三份。请注意我方的报价有效期一直截止到11月15日，我方期望及早收到你方的订单。要注意我方的缝纫机销路不错，目前有关询盘许多，请及时采取必要的措施。×××谨上

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