单项选择题

What is the main theme of the following passage

A．Strengths of paper books over E-books.
B．Projected extinction of paper books.
C．Market prospects of E-books.
D．The history of paper books.
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When commenting on the present role of the UN, the author expresses his
A．dissatisfaction.
B．disillusionment.
C．objection.
D．doubt.
单项选择题
In the following passage the author intends to
A．explain how the Gulf Stream is formed.
B．compare global warming with global cooling.
C．explain the composition of the sea currents.
D．deliver a warning of a coming ice age.
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