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【单选题】
If total revenue increases at a constant rate as output increases, marginal revenue:A.
is greater than average revenue.
B.
is less than average revenue.
C.
is greater than average revenue at low levels of output and less than average revenue at high levels of output.
D.
equals average revenue.
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反馈参考答案：
举一反三
【多选题】下列关于食管的叙述正确的是
A.
分颈部、胸部和腹部三部分
B.
第一狭窄距中切牙15cm
C.
食管全长约25cm
D.
食管第三狭窄相当于第10胸椎水平
E.
食管上端在相当于第6颈椎下缘水平续于喉咽
【简答题】Read and draw.（读短文，选择正确的答案） Tom has a beautiful bedroom (卧室). In his bedroom, there is a desk beside (在...旁边) the window. On the desk, it's his English book. Under the desk, it's his football. There...
【简答题】火眼金睛，选出不同类的单词。 ( ) 1. A. moming ( ) 2. A. fish ( ) 3. A. milk ( ) 4. A. orange ( ) 5. A. pizza ( ) 6. A. above ( ) 7. A. Tuesday ( ) 8. A. homework ( ) 9. A. soap (...
【单选题】his bedroom to get on with it【C3】______,
A.
quickly
B.
quietly
C.
carefully
D.
attentively
【简答题】连词组句。 1. have, I, a, bedroom . 2. shoes, his, are, his, bed, below . 3. in, the, evening, bed, goes, to, he ___________________________. 4. His, lamp, his, bed, beside. Is ___________________________....
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