题目内容

在《物流标准体系表》所附明细表中主要列出的，一是已经出台的有使用价值，但标准之间衔接性差、标准规范不相一致，需要尽快修订的标准；二是市场当前急需的应尽快着手制定的标准。()

A. 正确
B. 错误

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Directions: In this section, you will hear 3 short passages. At the end of each passage,you will hear some questions. Both the passage and the questions will be spoken only once. After you hear 8 question,you must choose the best answerfrom the four choices markedA），B），C)and D). Then mark the corresponding letter on . Answer Sheet2 with a single line through the centre.
Passage One
Questions 26 to 29 are based on the passage you have just heard.

At school.
B. At home.
C. At Youth Clubs.
D. At Youth Centers.

某超市购进一批原来单价是2．5元的方便面，现价3元，那么半个月可以售出200桶，据以往经验，提高单价会降低销售量，每提高I元，销售量相对减少20桶，问当单价提高多少时，利润最高？（）

A. 5．75
B. 4．75
C. 5．5
D. 4．5