单项选择题

What was London's average maximum summer temperature in the early 1970s

A．22.5℃.
B．20.5℃.
C．21.5℃.
D．1℃.
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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.
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.
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