已知某种存货的全年需要量为6000个单位，假设一年工作日为300天，预计不设保险储备情况下的再订货点为500单位，则该存货的订货提前期为( )天。
A．12
B．15
C．25
D．30
参考答案：C
解析： 依题意，原材料每日耗用量=6000÷300=20(单位/天)，则订货提前期=预计交货期内原材料的用量÷原材料每日耗用量=500÷20=25(天)。
| 完形填空 When I was 16 years old, I made my first visit to Disneyland in America.It wasn't the first time I had been __1__.Like most English children I learned French at school and I had often been to France, so I was __2__ to speaking a foreign language to people who didn't understand __3__.But when I went to America, I was really looking forward to __4__ a nice easy holiday without any __5__ problems. How wrong I was! The __6__ began at the airport.I was looking for a __7__ telephone to give my friend Diana a __8__ and tell her that I had arrived.A(n) __9__ old man saw me looking lost and asked if he could __10__ me. "Yes," I said, "I want to give my friend a ring." "Well, that's nice," he said. "Are you getting __11__? But aren't you a bit __12__? " "Who is talking about marriage? " I replied. "I just want to give my friend a ring to tell her I've arrived.Can you tell me where there's a phone box? " "Oh! " he said, "There's a phone downstairs." When at last we did meet up, Diana __13__ the misunderstanding to me. "Don't worry," she said to me, "I had so many __14__ at first.There are lots of words which the Americans __15__ differently in meaning from us British.You'll soon get used to all the funny things they say.Most of the time, British and American people understand each other! " | ||||
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