In Britain the last stage for a bill to become law as Acts of parliament' is called______.

单项选择题Which of the following is the best solution to the problems mentioned in the passage

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

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

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

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