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【单选题】
规模经济指产出增加速度快于投入的增加速度。这里的“规模”即是指由生产能力的扩大而导致的较大生产批量。这里的“经济”，是指成本的节约、效益的提高或报酬的递增。根据以上定义，下列不属于规模经济的是( )。A.
一家工厂生产一辆自行车要投入10小时劳动，在成本不变的情况下，投入5000小时，产500辆车。工厂规模扩大后，生产5000辆车，只要30000小时的劳动时间
B.
一家工厂原年产钢500万吨，投入1亿资本，5000人，在技术水平不变的条件下，投入增加一倍，年产钢1000万吨
C.
甲企业的生产影响到乙企业，因其影响是正的，则甲企业的生产低于社会最优水平，但把他们合二为一，则此时的外部影响就“消失”了
D.
瑞士集中了大量生产手表的企业，形成较大的产业规模，既提高了效率，又降低了成本
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【单选题】—Must I leave the room now? —No, you . [ ]
A.
needn't
B.
can't
C.
mustn't
D.
couldn't
【简答题】流行性脑脊髓膜炎可用哪些药物作抗菌治疗？为什么？
【单选题】-May we leave the classroom now? -No, you _______. You _______ to leave until the bell rings.
A.
can't; are allowed
B.
mustn't; aren't allowed
C.
needn't; are allowed
D.
needn't; aren't allowed
【单选题】听力原文：The James were supposed to leave in the afternoon, but they couldn't get away until evening. When did the James leave?
A.
The James left that afternoon.
B.
The James didn't get away until afternoon.
C.
The James left in the evening.
D.
The James were supposed to leave in the evening.
【简答题】A．He can't leave his room. B．His homework should be done on time. C．He can't go shopping. D．His daily actions are limited.
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