采用历史成本计价的优点在于（） A．会计核算手续简化 B．可以防止企业随意更改 C．

《九章算术》“勾股”章有一题：“今有开门去阃（kun）一尺，不合二寸，问门广几何．”大意是说：今推开双门，门框距离门槛1尺，双门间的缝隙为2寸，那么门的宽度（两扇门的和）为（        ）尺．

连词成句。

1. is, There, a, closet, my, room, in (.)

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2. trash bin, Where, the, is (?)

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3. you, make, bed, the ,Can (?)

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4. this, your, bedroom, Is (?)

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5. it, like, What's (?)

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-We all had a lot of fun at the barbecue yesterday. Pity you weren't there.

-I really  should have gone with you but I ________ on some important problems.[ ]

A．worked  

B．was working

C．would work  

D．would have worked

钢水的凝固过程包括（）。

A.开始凝固

B.过程凝固

C.形核

D.核长大