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【单选题】
In November 1965, New York was blacked out by an electricity failure. The authorities promised that it would not happen again. Pessimists were certain that it would occur again within five years at the latest. In July 1997,there was a repeat performance which produced varying degrees of chaos throughout the city of eight million people. In 1965,the failure occurred in the cool autumn and at a time of comparative prosperity. In 1997,tha disaster was much more serious because it came when unemployment was high and the city was suffering from one of its worst heat waves. In 1965, there was little crime or looting during the darkness, and fewer than a hundred people were arrested. In 1997, hundreds of stores were broken into and looted. Looters smashed shop windows and helped themselves to jewelry, clothes or television sets. Nearly 4 000 people were arrested but far more disappeared into the darkness of the night. The number of policemen available was quite inadequate and they wisely refrained from using their guns against mobs which far outnumbered them and included armed men. Hospitals had to treat hundreds of people cut by glass from shop windows. Banks and most businesses remained closed the next day. The blackout started at 9:30 p.m., when lightning hit and knocked out vital cables. Many stores were thus caught by surprise. The vast majority of New Yorkers, however, were not involved in looting. They helped strangers, distributed candles and batteries, and tried to survive in a nightmare world without traffic lights, refrigerators, elevators, water and electrical power. For twenty-four hours, New York realized how helpless it was without electricity. From the first paragraph, we know that ______ were right.
A.
the authorities
B.
the pessimists
C.
both the authorities and the pessimists
D.
neither the authorities nor the pessimists
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参考答案:
举一反三
【单选题】灭菌是指
A.
防止或抑制细菌生长繁殖,以防污染
B.
杀灭和清除外环境中的病原微生物
C.
用物理或化学方法杀灭微生物,其中包括细菌繁殖体、芽胞、真菌和病毒
D.
防止杂菌污染
E.
用消毒剂杀灭细菌繁殖体
【单选题】防腐的定义是
A.
防止或抑制细菌生长繁殖,以防污染
B.
杀灭和清除外环境中的病原微生物
C.
用物理或化学方法杀灭微生物
D.
防止杂菌污染
E.
芽胞、真菌和病毒
【单选题】若要在一对多的关联关系中,“一方”原始记录更改后,“多方”自动更改,应启用
A.
有效性规则
B.
级联更新相关记录
C.
完整性规则
D.
级联删除相关记录
【单选题】若要在一对多的关联关系中,“一方”原始记录更改后,“多方”自动更改,应启用( )。
A.
完整性规则
B.
级联删除相关记录
C.
级联更新相关记录
D.
有效性规则
【单选题】若要在一对多的关联关系中,“一方”原始记录更改后,“多方”自动更改,应启用( )。
A.
验证规则
B.
级联更新相关记录
C.
完整性规则
D.
级联删除相关记录
【简答题】The developers are now testing the iPhone app in rural areas,where cell phone reception is more problematic than in cities.
【单选题】若要在一对多的关联关系中,“一方”原始记录更改后,“多方”自动更改,应启用的是
A.
有效性规则
B.
级联删除相关记录
C.
完整性规则
D.
级联更新相关记录
【单选题】防腐是指
A.
防止或抑制细菌生长繁殖,以防污染
B.
杀灭和清除外环境中的病原微生物
C.
用物理或化学方法杀灭微生物
D.
防止杂菌污染
E.
用消毒剂杀灭细菌繁殖体、芽胞、真菌和病毒
【单选题】防腐是指
A.
防止或抑制细菌生长繁殖,以防污染
B.
杀灭和清除外环境中的病原微生物
C.
用物理或化学方法杀灭病原微生物
D.
没有活菌存在
E.
杀灭环境中的所有微生物
【单选题】(2019 ·江苏如皋实验初中一模· 18) 袁世凯就任临时大总统后公然背弃誓言,妄图建立独裁统治。下列史实能佐证的有 ( ) 1指使刺杀宋教仁 2镇压二次革命 3废除《中华民国临时约法》 4发动护国战争
A.
①④
B.
①②③
C.
②③④
D.
②④
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