单项选择题

A．The use of fuels other than gasoline.B．Improved energ……

Which of the following is practical but only makes a marginal contribution to solving the problem of greenhouse emissions

A．The use of fuels other than gasoline.
B．Improved energy efficiency.
C．The introduction of less polluting driving systems.
D．Reducing car use by carpooling.

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单项选择题The U.S. has to deal with the problems arising from vehicle use he cause______.

A．most Americans are reluctant to switch to public transportation systems
B．the present level of oil prices is considered unacceptable
C．other countries will protest its increasing greenhouse emissions
D．it should take a lead in conserving natural resources

单项选择题From the passage we know that the increased use of cars will______.

A．consume half of the oil produced in the world
B．have serious consequences for the well-being of all nations
C．widen the gap between the developed and developing countries
D．impose an intolerable economic burden on residents of large cities

单项选择题The result of the search for an easily digestible fat turned out to be______.

A．commercially useless
B．just as anticipated
C．somewhat controversial
D．quite unexpected

单项选择题Olestra is different from ordinary fats in that ______.

A．it passes through the intestines without being absorbed
B．it facilitates the absorption of vitamins by the body
C．it helps reduce the incidence of heart disease
D．it prevents excessive intake of vitamins

单项选择题We learn from the passage that olestra is a substance that______.

A．contains plenty of nutrients
B．renders foods calorie-free while retaining their vitamins
C．makes foods easily digestible
D．makes foods fat free while keeping them delicious