单项选择题

Lead accumulation worldwide decreased significantly after the use of unleaded gas in the US______

A．was discouraged
B．was enforced by law
C．was prohibited by law
D．was introduced
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单项选择题
A new law may be passed by the British Parliament to ______
A．prohibit farmers from hunting foxes
B．forbid hunting foxes with dogs
C．stop hunting wild animals in the countryside
D．prevent large-scale fox hunting
单项选择题
It can be inferred from the passage that______
A．killing foxes with poison is illegal
B．limiting file fox population is unnecessary
C．hunting foxes with dogs is considered cruel and violent
D．fox-hunting often leads to confrontation between the poor and file rich
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