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单项选择 1. The mistakes of the past must be exposed without any ______. A. store B. save C. reserve D. keep 2. They agreed to ______ four tickets for us. A. preserve B. protect C. defend D. reserve 3. The Internet should be developed to help people rather than ______ people. A. to endanger B. danger C. endanger D. endangering 4. The lion made a sudden angry noise and ______. A. struggled on its feet B. leaped to feet C. leaped on its feet D. struggled to its feet 5.—Who should be responsible for the accident? —The boss, not the workers. They just carried out the order ______. A. as told B. as are told C. as telling D. as they told 6. Man is fighting ______ against the pollution. A. a battle B. a war C. a fight D. a struggle 7. He was prepared to ______ for the revolutionary cause. A. giving his life B. give his life | 
