（） is the oldest and fastest-growing form of e-commerce, which allows e-business to collaborate, partner, and share research and complex data with other businesses.

单项选择题In the initial stage of Alibaba, the （） threshold was taken to attract companies for free membership.

A.slow
B.fast
C.high
D.low

单项选择题Details of the proposed offering are disclosed to potential purchasers in the form of a lengthy document known as a （）.

A.prospect
B.decision
C.prospectus
D.award

单项选择题Through the process of IPO, a privately held company is transformed into a （）company.

A.private
B.public
C.open
D.closed

单项选择题In 2014, Alibaba Group held its IPO in （）.

A.NASDAQ
B.New York Stock Exchange
C.Hong Kong Exchanges and Clearing Limited
D.Toronto Stock Exchange

单项选择题Items that can be auctioned on eBay range from toys, books and vacuum cleaners to cars, houses and （）.

A.alcohol
B.tobacco
C.drugs
D.land