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采用边际成本定价时，自然垄断行业会产生亏损。
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Listen to the passage twice ad fill in the blanks with the missing words.My first day in college was a new and different experience for me. The ______ changed my thoughts towards life. The first ________ of this campus was the beautiful scenery. Green trees and colorful flowers could be seen everywhere. Everything around me seemed so ________. The buildings were so tall, and the people were so _______ _. I was very excited the first day. “Excited”, “happy” and “” are the words to describe my first day in college. I hope every day can be as nice as that day in the future.
刚性基础能跨越基底中部，将所承担的荷载相对集中地传至基底边缘的现象叫做基础的“架越作用”。
基础相对刚度越大，架越作用越明显，基底压力分布与上部荷载分布越不一致。
( ) 1. The boy is a freshman.( ) 2. The girl gets lost on campus.( ) 3. It is the first day of attending class in college for the girl.( ) 4. The boy means freshmen seldom get lost on campus.( ) 5. The boy strongly advises the girl to buy a map.
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