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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单项选择题

What is the most appropriate topic of the following passage

A．Strikes.
B．Pensions.
C．Retirement ages.
D．Government decisions.

单项选择题

According to the passage, which is NOT a reponsibility of the proposed internationalauthority

A．Monitoring effects of scientific discoveries.
B．Dealing with worldwide environmental issues.
C．Vetoing human attempts to conquer Nature.
D．Authorizing efforts to improve human health.