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A month ago, the British government announced a plan to keep terrorist suspects indefinitely under house arrest (1)_____ the home secretary's say-so, It has been attacked from all sides ever since. This week the government backtracked. Under the Prevention of Terrorism bill, (2)_____ to Parliament this week, house arrest would (3)_____ a potential (4)_____ in the government's ever-expanding anti-terrorist arsenal, but the government would first have to (5)_____ of Article 5 of the European Convention on Human Rights guaranteeing a right to liberty. Parliament would have to vote on that.
The government could do this (6)_____ the terrorist threat to Britain, already described by the government as ' (7)_____', got even worse. Even then, the powers would remain (8)_____ by political and judicial safeguards. Before the home secretary could make a house-arrest order, he would have to be satisfied on the (9)_____ of probabilities—no longer on the basis of 'reasonable suspicion—that the suspect has been 'involved in a terrorism-related activity'. He would also have to be (10)_____ that such an order was 'strictly required'. The period of house-arrest will be limited to a maximum of six months, extendable through a new house-arrest order. Within seven days of its being imposed, the High Court would have to confirm that the home secretary had ' (11)_____ grounds' for making such an order. Even if it were so satisfied, the case would go on to a full court (12)_____.
The bill also provides for a whole range of lesser restrictions including tagging, curfews, a ban on association with specified people, prohibitions on using phones, restrictions on travel, and so on. (13)_____ to meet the threat (14)_____ by each suspect and limited to a renewable period of 12 months, these would not be subject to the same judicial scrutiny as house arrest. Nor would they require (15)_____ from the European convention.
But the new orders, including house arrest, would be used only where a suspected terrorist could not be prosecuted (16)_____ because the evidence against him was not admissible in court, or because it might (17)_____ intelligence sources or (18)_____ techniques. Charles Clarke insists that he would prefer to prosecute. (19)_____ the home secretary is considering further anti-terrorist legislation, including making it (20)_____ to be involved in the preparation or commission of terrorist acts.
A.on
B.by
C.at
D.for

A.
B.
C.
D.
A.on
B.by
C.at
D.for


【参考答案】

A
解析:介词辨析。on表示'根据,基础,条件';by表示'动因,理由';at表示'原因';for表示'原因'。......

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