单项选择题

Which of the following is not mentioned as an effect of climate change

A．It will generate more intense rainstorms.
B．It will generate more intense heat waves.
C．It will affect the growth of economy.
D．It will generate more intense droughts.

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单项选择题

Why does VOIP cost less

A．Because it uses separate service providers.
B．Because it needs less working stuff to offer service.
C．Because service is provided through e-mail.
D．Because service is charged monthly.

单项选择题

Which statement is NOT true about VOIP

A．It is the cheapest way of world-wide communication.
B．It is a good way to build strong relations.
C．It has the same quality as the traditional telephone service.
D．It uses a single network to transfer voice and dat