答案:【计分规则】: 第一句话,总述,答出得3分:The Prime Minister is the head of government in Britain. 第二句话,分述,答出得3分:He or she controls not only the Cabinet, but also the Parliament. 第三句话,分述,答出得3分:Cabinet is the at the center of the British political system. Cabinet members are chosen by the Prime Minister from members of his own party in Parliament. 第四句话,分述,答出得3分:The Prime Minister is the leader of the majority party in Parliament.第五句话,总结,答出得3分:Since the King or Queen's power is limited, the Prime Minister is in effect the most powerful leader in Britain.