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某工程有4个不同的土方施工项目，要分派4台推土机去完成，每台承担各项任务的台班产值见表4-1所示。请回答以下相关问题，以求出台班总产值最高的机械分派方案。

其台班总产值最高的为：（）。

A.250元

B.300元

C.350元

D.400元

答案

参考答案：B

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Problems Solutions
( )1. Mary's friend wants to copy (抄袭)
              her homework. 
( )2. Jack lost his school bag in the library. 
( )3. David's mother is ill, but his father isn't at home.
( )4. Cathy was sitting on the bus when an old man
          got on. 
( )5. Brian saw a purse on the road. And there is
        some moneyand an address (地址) card with the
         telephone number of the owner in it.
A. She should pretend (假装) to be asleep.
B. He should send for a doctor.
C. He should keep it and buy some books
    for himself.
D. He should go to the Lost and Found.
E. He should call the owner. And tell him / her
   to get his / her purse back.
F. She should offer her seat to the old man.
G. She should say "no" to her friend, and tell
    him / her it's wrong to do so.
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选择题

—Whose schoolbag is this?

—It ___________ be Mary’s. It has her name on it.

A．can

B．may

C．will

D．must
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