单项选择题

Due（）technological changes，our life becomes more and more convenient.

A.to
B.in
C.of
D.with

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单项选择题

Which of the following is a similarity between a demand draft and a trade acceptance？（）

A.both are examples of sight drafts
B.both require credit to be extended to the buyer
C.both have the drawer to be the payee as well
D.both are considered two-party transactions

单项选择题

He immediately bought the bird and sent it to his mother.It （）him $50.

A.spent
B.paid
C.took
D.cost